diff --git a/projects/ucap-webmessenger-app/src/app/layouts/messenger/components/left-sidenav/chat.component.html b/projects/ucap-webmessenger-app/src/app/layouts/messenger/components/left-sidenav/chat.component.html
index 2e6712f0..187f8359 100644
--- a/projects/ucap-webmessenger-app/src/app/layouts/messenger/components/left-sidenav/chat.component.html
+++ b/projects/ucap-webmessenger-app/src/app/layouts/messenger/components/left-sidenav/chat.component.html
@@ -1,3 +1,7 @@
-<ucap-room-list-item *ngFor="let room of roomList" [roomInfo]="room" [roomUserInfo]="getRoomUserList(room)"
-  (click)="onSelectedRoom(room)">
+<ucap-room-list-item
+  *ngFor="let room of roomList"
+  [roomInfo]="room"
+  [roomUserInfo]="getRoomUserList(room)"
+  (click)="onSelectedRoom(room)"
+>
 </ucap-room-list-item>
diff --git a/projects/ucap-webmessenger-app/src/app/layouts/messenger/components/left-sidenav/chat.component.ts b/projects/ucap-webmessenger-app/src/app/layouts/messenger/components/left-sidenav/chat.component.ts
index 08bf7caa..1b1ce638 100644
--- a/projects/ucap-webmessenger-app/src/app/layouts/messenger/components/left-sidenav/chat.component.ts
+++ b/projects/ucap-webmessenger-app/src/app/layouts/messenger/components/left-sidenav/chat.component.ts
@@ -2,7 +2,7 @@ import { Component, OnInit, OnDestroy } from '@angular/core';
 import { ucapAnimations } from '@ucap-webmessenger/ui';
 import { NGXLogger } from 'ngx-logger';
 import { Store, select } from '@ngrx/store';
-import { Subscription } from 'rxjs';
+import { Subscription, combineLatest } from 'rxjs';
 import {
   RoomInfo,
   UserInfoShort,
@@ -10,7 +10,11 @@ import {
 } from '@ucap-webmessenger/protocol-room';
 import * as AppStore from '@app/store';
 import * as ChatStore from '@app/store/messenger/chat';
-import { tap } from 'rxjs/operators';
+import { tap, map } from 'rxjs/operators';
+import {
+  RoomUserDetailData,
+  RoomUserData
+} from '@ucap-webmessenger/protocol-sync';
 
 @Component({
   selector: 'app-layout-chat-left-sidenav-chat',
@@ -20,24 +24,30 @@ import { tap } from 'rxjs/operators';
 })
 export class ChatComponent implements OnInit, OnDestroy {
   roomList: RoomInfo[];
-  roomUserInfoMap: {
-    [param: string]: {
-      userInfoShortList: UserInfoShort[];
-      userInfoList: RoomUserInfo[];
-    };
-  };
+  roomUserList: RoomUserDetailData[];
+  roomUserShortList: RoomUserData[];
 
   roomSubscription: Subscription;
 
   constructor(private store: Store<any>, private logger: NGXLogger) {}
 
   ngOnInit() {
-    this.roomSubscription = this.store
+    this.roomSubscription = combineLatest([
+      this.store.pipe(
+        select(AppStore.MessengerSelector.SyncSelector.selectAllRoom)
+      ),
+      this.store.pipe(
+        select(AppStore.MessengerSelector.SyncSelector.selectAllRoomUser)
+      ),
+      this.store.pipe(
+        select(AppStore.MessengerSelector.SyncSelector.selectAllRoomUserShort)
+      )
+    ])
       .pipe(
-        select(AppStore.MessengerSelector.SyncSelector.room),
-        tap(room => {
-          this.roomList = room.roomList;
-          this.roomUserInfoMap = room.roomUserInfoMap;
+        tap(([room, roomUser, roomUserShort]) => {
+          this.roomList = room;
+          this.roomUserList = roomUser;
+          this.roomUserShortList = roomUserShort;
         })
       )
       .subscribe();
@@ -54,17 +64,22 @@ export class ChatComponent implements OnInit, OnDestroy {
   }
 
   getRoomUserList(roomInfo: RoomInfo): RoomUserInfo[] | UserInfoShort[] {
-    if (
-      !!this.roomUserInfoMap[roomInfo.roomSeq].userInfoList &&
-      0 < this.roomUserInfoMap[roomInfo.roomSeq].userInfoList.length
-    ) {
-      return this.roomUserInfoMap[roomInfo.roomSeq].userInfoList;
+    if (!!this.roomUserList && 0 < this.roomUserList.length) {
+      const i = this.roomUserList.findIndex(
+        value => roomInfo.roomSeq === value.roomSeq
+      );
+      if (-1 < i) {
+        return this.roomUserList[i].userInfos;
+      }
     }
-    if (
-      !!this.roomUserInfoMap[roomInfo.roomSeq].userInfoShortList &&
-      0 < this.roomUserInfoMap[roomInfo.roomSeq].userInfoShortList.length
-    ) {
-      return this.roomUserInfoMap[roomInfo.roomSeq].userInfoShortList;
+
+    if (!!this.roomUserShortList && 0 < this.roomUserShortList.length) {
+      const i = this.roomUserShortList.findIndex(
+        value => roomInfo.roomSeq === value.roomSeq
+      );
+      if (-1 < i) {
+        return this.roomUserShortList[i].userInfos;
+      }
     }
   }
 }
diff --git a/projects/ucap-webmessenger-app/src/app/layouts/messenger/components/left-sidenav/group.component.ts b/projects/ucap-webmessenger-app/src/app/layouts/messenger/components/left-sidenav/group.component.ts
index 7df6d991..a156a920 100644
--- a/projects/ucap-webmessenger-app/src/app/layouts/messenger/components/left-sidenav/group.component.ts
+++ b/projects/ucap-webmessenger-app/src/app/layouts/messenger/components/left-sidenav/group.component.ts
@@ -67,49 +67,31 @@ export class GroupComponent implements OnInit {
       select(AppStore.SettingSelector.CompanySelector.companyList)
     );
 
-    this.groupBuddyList$ = this.store
-      .pipe(
-        select(AppStore.MessengerSelector.SyncSelector.groupListAndBuddyList)
+    this.groupBuddyList$ = combineLatest([
+      this.store.pipe(
+        select(AppStore.MessengerSelector.SyncSelector.selectAllBuddy2)
+      ),
+      this.store.pipe(
+        select(AppStore.MessengerSelector.SyncSelector.selectAllGroup2)
       )
-      .pipe(
-        map(groupListAndBuddyList => {
-          const groupList = groupListAndBuddyList.groupList
-            .slice()
-            .sort((a, b) => {
-              // 기본그룹은 제일 하단
-              if (0 === a.seq) {
-                return 1;
-              } else if (0 === b.seq) {
-                return -1;
-              } else {
-                if (a.name > b.name) {
-                  return 1;
-                }
-                if (b.name > a.name) {
-                  return -1;
-                }
-                return 0;
-              }
-            });
-
-          const groupBuddyList: {
-            group: GroupDetailData;
-            buddyList: UserInfo[];
-          }[] = [];
-          for (const group of groupList) {
-            const buddyList = groupListAndBuddyList.buddyList.filter(buddy => {
+    ]).pipe(
+      map(([buddyList, groupList]) => {
+        const groupBuddyList: {
+          group: GroupDetailData;
+          buddyList: UserInfo[];
+        }[] = [];
+        for (const group of groupList) {
+          groupBuddyList.push({
+            group,
+            buddyList: buddyList.filter(buddy => {
               return group.userSeqs.indexOf(buddy.seq) > -1;
-            });
+            })
+          });
+        }
 
-            groupBuddyList.push({
-              group,
-              buddyList
-            });
-          }
-
-          return groupBuddyList;
-        })
-      );
+        return groupBuddyList;
+      })
+    );
   }
 
   async onClickGroupMenu(menuType: string) {
diff --git a/projects/ucap-webmessenger-app/src/app/resolvers/messenger.resolver.ts b/projects/ucap-webmessenger-app/src/app/resolvers/messenger.resolver.ts
index d20fadb4..a60e36f2 100644
--- a/projects/ucap-webmessenger-app/src/app/resolvers/messenger.resolver.ts
+++ b/projects/ucap-webmessenger-app/src/app/resolvers/messenger.resolver.ts
@@ -135,13 +135,17 @@ export class AppMessengerResolver implements Resolve<void> {
           }),
           withLatestFrom(
             this.store.pipe(
-              select(AppStore.MessengerSelector.SyncSelector.buddy2SyncDate)
+              select(
+                AppStore.MessengerSelector.SyncSelector.selectBuddy2SyncDate
+              )
             ),
             this.store.pipe(
-              select(AppStore.MessengerSelector.SyncSelector.group2SyncDate)
+              select(
+                AppStore.MessengerSelector.SyncSelector.selectGroup2SyncDate
+              )
             ),
             this.store.pipe(
-              select(AppStore.MessengerSelector.SyncSelector.roomSyncDate)
+              select(AppStore.MessengerSelector.SyncSelector.selectRoomSyncDate)
             )
           ),
           map(([_, buddy2SyncDate, group2SyncDate, roomSyncDate]) => {
diff --git a/projects/ucap-webmessenger-app/src/app/store/messenger/sync/effects.ts b/projects/ucap-webmessenger-app/src/app/store/messenger/sync/effects.ts
index 9ff0bda7..3d8565d2 100644
--- a/projects/ucap-webmessenger-app/src/app/store/messenger/sync/effects.ts
+++ b/projects/ucap-webmessenger-app/src/app/store/messenger/sync/effects.ts
@@ -208,15 +208,15 @@ export class Effects {
         ofType(ChatStore.newEventMessage),
         withLatestFrom(
           this.store.pipe(
-            select((state: any) => state.messenger.sync.roomList as RoomInfo[])
+            select((state: any) => state.messenger.sync.room.ids as string[])
           ),
           this.store.pipe(
-            select((state: any) => state.messenger.sync.roomSyncDate as string)
+            select((state: any) => state.messenger.sync.room.syncDate as string)
           )
         ),
-        tap(([action, roomList, roomSyncDate]) => {
-          const index = roomList.findIndex(
-            (roomInfo, i) => roomInfo.roomSeq === action.roomSeq
+        tap(([action, roomSeqList, roomSyncDate]) => {
+          const index = roomSeqList.findIndex(
+            (roomSeq, i) => roomSeq === action.roomSeq
           );
 
           if (-1 === index) {
diff --git a/projects/ucap-webmessenger-app/src/app/store/messenger/sync/reducers.ts b/projects/ucap-webmessenger-app/src/app/store/messenger/sync/reducers.ts
index 88b8fbcc..32ac7b2a 100644
--- a/projects/ucap-webmessenger-app/src/app/store/messenger/sync/reducers.ts
+++ b/projects/ucap-webmessenger-app/src/app/store/messenger/sync/reducers.ts
@@ -1,62 +1,95 @@
 import { createReducer, on } from '@ngrx/store';
-import { initialState } from './state';
+import {
+  initialState,
+  adapterBuddy2,
+  adapterGroup2,
+  adapterRoom,
+  adapterRoomUser,
+  adapterRoomUserShort
+} from './state';
 import {
   buddy2Success,
   group2Success,
   roomSuccess,
   updateRoomForNewEventMessage
 } from './actions';
-
-import { RoomInfo } from '@ucap-webmessenger/protocol-room';
+import {
+  RoomUserDetailData,
+  RoomUserData
+} from '@ucap-webmessenger/protocol-sync';
 
 export const reducer = createReducer(
   initialState,
   on(buddy2Success, (state, action) => {
     return {
       ...state,
-      buddyInfoList: [...state.buddyInfoList, ...action.buddyList],
-      buddy2SyncDate: action.syncDate
+      buddy2: adapterBuddy2.addAll(action.buddyList, {
+        ...state.buddy2,
+        syncDate: action.syncDate
+      })
     };
   }),
 
   on(group2Success, (state, action) => {
     return {
       ...state,
-      groupList: [...state.groupList, ...action.groupList],
-      group2SyncDate: action.syncDate
+      group2: adapterGroup2.addAll(action.groupList, {
+        ...state.group2,
+        syncDate: action.syncDate
+      })
     };
   }),
 
   on(roomSuccess, (state, action) => {
+    const roomUserList: RoomUserDetailData[] = [];
+    const roomUserShortList: RoomUserData[] = [];
+
+    for (const key in action.roomUserInfoMap) {
+      if (action.roomUserInfoMap.hasOwnProperty(key)) {
+        const element = action.roomUserInfoMap[key];
+        if (!!element.userInfoList && 0 < element.userInfoList.length) {
+          roomUserList.push({ roomSeq: key, userInfos: element.userInfoList });
+        }
+        if (
+          !!element.userInfoShortList &&
+          0 < element.userInfoShortList.length
+        ) {
+          roomUserShortList.push({
+            roomSeq: key,
+            userInfos: element.userInfoShortList
+          });
+        }
+      }
+    }
+
     return {
       ...state,
-      roomList: [...state.roomList, ...action.roomList],
-      roomUserInfoMap: {
-        ...state.roomUserInfoMap,
-        ...action.roomUserInfoMap
-      },
-      roomSyncDate: action.syncDate
+      room: adapterRoom.addAll(action.roomList, {
+        ...state.room,
+        syncDate: action.syncDate
+      }),
+      roomUser: adapterRoomUser.addAll(roomUserList, {
+        ...state.roomUser
+      }),
+      roomUserShort: adapterRoomUserShort.addAll(roomUserShortList, {
+        ...state.roomUserShort
+      })
     };
   }),
 
   on(updateRoomForNewEventMessage, (state, action) => {
-    const roomList: RoomInfo[] = [];
-
-    state.roomList.forEach((roomInfo, index) => {
-      if (roomInfo.roomSeq === action.roomSeq) {
-        roomList.push({
-          ...roomInfo,
-          finalEventDate: action.info.sendDate,
-          finalEventMessage: action.info.sentMessage
-        });
-      } else {
-        roomList.push(roomInfo);
-      }
-    });
+    const roomInfo = {
+      ...state.room.entities[action.roomSeq],
+      finalEventDate: action.info.sendDate,
+      finalEventMessage: action.info.sentMessage
+    };
 
     return {
       ...state,
-      roomList
+      room: adapterRoom.updateOne(
+        { id: action.roomSeq, changes: roomInfo },
+        { ...state.room }
+      )
     };
   })
 );
diff --git a/projects/ucap-webmessenger-app/src/app/store/messenger/sync/state.ts b/projects/ucap-webmessenger-app/src/app/store/messenger/sync/state.ts
index 7f951390..015705cb 100644
--- a/projects/ucap-webmessenger-app/src/app/store/messenger/sync/state.ts
+++ b/projects/ucap-webmessenger-app/src/app/store/messenger/sync/state.ts
@@ -1,77 +1,194 @@
 import { Selector, createSelector } from '@ngrx/store';
-import { UserInfo, GroupDetailData } from '@ucap-webmessenger/protocol-sync';
+import { EntityState, createEntityAdapter } from '@ngrx/entity';
+import {
+  UserInfo,
+  GroupDetailData,
+  RoomUserData,
+  RoomUserDetailData
+} from '@ucap-webmessenger/protocol-sync';
 import {
   RoomInfo,
   UserInfoShort,
   UserInfo as RoomUserInfo
 } from '@ucap-webmessenger/protocol-room';
 
-export interface State {
-  buddyInfoList: UserInfo[];
-  buddy2SyncDate: string;
-
-  groupList: GroupDetailData[];
-  group2SyncDate: string;
-
-  roomList: RoomInfo[];
-  roomUserInfoMap: {
-    [param: string]: {
-      userInfoShortList: UserInfoShort[];
-      userInfoList: RoomUserInfo[];
-    };
-  };
-  roomSyncDate: string;
+export interface Buddy2State extends EntityState<UserInfo> {
+  syncDate: string;
 }
 
+export interface Group2State extends EntityState<GroupDetailData> {
+  syncDate: string;
+}
+
+export interface RoomState extends EntityState<RoomInfo> {
+  syncDate: string;
+}
+
+export interface RoomUserState extends EntityState<RoomUserDetailData> {}
+
+export interface RoomUserShortState extends EntityState<RoomUserData> {}
+
+export interface State {
+  buddy2: Buddy2State;
+  group2: Group2State;
+  room: RoomState;
+  roomUser: RoomUserState;
+  roomUserShort: RoomUserShortState;
+}
+
+export const adapterBuddy2 = createEntityAdapter<UserInfo>({
+  selectId: userInfo => userInfo.seq
+});
+export const adapterGroup2 = createEntityAdapter<GroupDetailData>({
+  selectId: groupDetailData => groupDetailData.seq,
+  sortComparer: (a, b) => {
+    // 기본그룹은 제일 하단
+    if (0 === a.seq) {
+      return 1;
+    } else if (0 === b.seq) {
+      return -1;
+    } else {
+      if (a.name > b.name) {
+        return 1;
+      }
+      if (b.name > a.name) {
+        return -1;
+      }
+      return 0;
+    }
+  }
+});
+export const adapterRoom = createEntityAdapter<RoomInfo>({
+  selectId: roomInfo => roomInfo.roomSeq,
+  sortComparer: (a, b) => {
+    return (
+      new Date(b.finalEventDate).getTime() -
+      new Date(a.finalEventDate).getTime()
+    );
+  }
+});
+export const adapterRoomUser = createEntityAdapter<RoomUserDetailData>({
+  selectId: roomUserDetailData => roomUserDetailData.roomSeq
+});
+export const adapterRoomUserShort = createEntityAdapter<RoomUserData>({
+  selectId: roomUserData => roomUserData.roomSeq
+});
+
+const buddy2InitialState: Buddy2State = adapterBuddy2.getInitialState({
+  syncDate: ''
+});
+const group2InitialState: Group2State = adapterGroup2.getInitialState({
+  syncDate: ''
+});
+const roomInitialState: RoomState = adapterRoom.getInitialState({
+  syncDate: ''
+});
+const roomUserInitialState: RoomUserState = adapterRoomUser.getInitialState({});
+const roomUserShortInitialState: RoomUserShortState = adapterRoomUserShort.getInitialState(
+  {}
+);
+
 export const initialState: State = {
-  buddyInfoList: [],
-  buddy2SyncDate: '',
-  groupList: [],
-  group2SyncDate: '',
-  roomList: [],
-  roomUserInfoMap: {},
-  roomSyncDate: ''
+  buddy2: buddy2InitialState,
+  group2: group2InitialState,
+  room: roomInitialState,
+  roomUser: roomUserInitialState,
+  roomUserShort: roomUserShortInitialState
 };
 
+const {
+  selectAll: ngeSelectAllBuddy2,
+  selectEntities: ngeSelectEntitiesBuddy2,
+  selectIds: ngeSelectIdsBuddy2,
+  selectTotal: ngeSelectTotalBuddy2
+} = adapterBuddy2.getSelectors();
+
+const {
+  selectAll: ngeSelectAllGroup2,
+  selectEntities: ngeSelectEntitiesGroup2,
+  selectIds: ngeSelectIdsGroup2,
+  selectTotal: ngeSelectTotalGroup2
+} = adapterGroup2.getSelectors();
+
+const {
+  selectAll: ngeSelectAllRoom,
+  selectEntities: ngeSelectEntitiesRoom,
+  selectIds: ngeSelectIdsRoom,
+  selectTotal: ngeSelectTotalRoom
+} = adapterRoom.getSelectors();
+
+const {
+  selectAll: ngeSelectAllRoomUser,
+  selectEntities: ngeSelectEntitiesRoomUser,
+  selectIds: ngeSelectIdsRoomUser,
+  selectTotal: ngeSelectTotalRoomUser
+} = adapterRoomUser.getSelectors();
+
+const {
+  selectAll: ngeSelectAllRoomUserShort,
+  selectEntities: ngeSelectEntitiesRoomUserShort,
+  selectIds: ngeSelectIdsRoomUserShort,
+  selectTotal: ngeSelectTotalRoomUserShort
+} = adapterRoomUserShort.getSelectors();
+
 export function selectors<S>(selector: Selector<any, State>) {
+  const selectBuddy2 = createSelector(
+    selector,
+    (state: State) => state.buddy2
+  );
+
+  const selectGroup2 = createSelector(
+    selector,
+    (state: State) => state.group2
+  );
+
+  const selectRoom = createSelector(
+    selector,
+    (state: State) => state.room
+  );
+
+  const selectRoomUser = createSelector(
+    selector,
+    (state: State) => state.roomUser
+  );
+
+  const selectRoomUserShort = createSelector(
+    selector,
+    (state: State) => state.roomUserShort
+  );
+
   return {
-    buddyInfoList: createSelector(
-      selector,
-      (state: State) => state.buddyInfoList
+    selectAllBuddy2: createSelector(
+      selectBuddy2,
+      ngeSelectAllBuddy2
     ),
-    buddy2SyncDate: createSelector(
-      selector,
-      (state: State) => state.buddy2SyncDate
+    selectBuddy2SyncDate: createSelector(
+      selectBuddy2,
+      buddy2State => buddy2State.syncDate
     ),
-    groupList: createSelector(
-      selector,
-      (state: State) => state.groupList
+    selectAllGroup2: createSelector(
+      selectGroup2,
+      ngeSelectAllGroup2
     ),
-    group2SyncDate: createSelector(
-      selector,
-      (state: State) => state.group2SyncDate
+    selectGroup2SyncDate: createSelector(
+      selectGroup2,
+      group2State => group2State.syncDate
     ),
-    groupListAndBuddyList: createSelector(
-      selector,
-      (state: State) => {
-        return {
-          groupList: state.groupList,
-          buddyList: state.buddyInfoList
-        };
-      }
+    selectAllRoom: createSelector(
+      selectRoom,
+      ngeSelectAllRoom
     ),
-    room: createSelector(
-      selector,
-      (state: State) => {
-        return {
-          roomList: state.roomList,
-          roomUserInfoMap: state.roomUserInfoMap
-        };
-      }
+    selectRoomSyncDate: createSelector(
+      selectRoom,
+      roomState => roomState.syncDate
     ),
-    roomSyncDate: createSelector(
-      selector,
-      (state: State) => state.roomSyncDate
+    selectAllRoomUser: createSelector(
+      selectRoomUser,
+      ngeSelectAllRoomUser
+    ),
+    selectAllRoomUserShort: createSelector(
+      selectRoomUserShort,
+      ngeSelectAllRoomUserShort
     )
   };
 }