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 69385770..e15a22b6 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 +1,9 @@
-<ucap-room-list-item *ngFor="let room of roomList" [roomInfo]="room" [roomUserInfo]="getRoomUserList(room)"
-  [sessionVerinfo]="sessionVerinfo" (click)="onSelectedRoom(room)">
+<ucap-room-list-item
+  *ngFor="let room of roomList"
+  [loginRes]="loginRes$ | async"
+  [roomInfo]="room"
+  [roomUserInfo]="getRoomUserList(room)"
+  [sessionVerinfo]="sessionVerinfo"
+  (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 15b0020d..a40630eb 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, combineLatest } from 'rxjs';
+import { Subscription, combineLatest, Observable } from 'rxjs';
 import {
   RoomInfo,
   UserInfoShort,
@@ -18,6 +18,7 @@ import {
 import { VersionInfo2Response } from '@ucap-webmessenger/api-public';
 import { SessionStorageService } from '@ucap-webmessenger/web-storage';
 import { KEY_VER_INFO } from '@app/types/ver-info.type';
+import { LoginResponse } from '@ucap-webmessenger/protocol-authentication';
 
 @Component({
   selector: 'app-layout-chat-left-sidenav-chat',
@@ -30,6 +31,7 @@ export class ChatComponent implements OnInit, OnDestroy {
   roomUserList: RoomUserDetailData[];
   roomUserShortList: RoomUserData[];
   sessionVerinfo: VersionInfo2Response;
+  loginRes$: Observable<LoginResponse>;
 
   roomSubscription: Subscription;
 
@@ -60,6 +62,10 @@ export class ChatComponent implements OnInit, OnDestroy {
       )
       .subscribe();
 
+    this.loginRes$ = this.store.pipe(
+      select(AppStore.AccountSelector.AuthenticationSelector.loginRes)
+    );
+
     this.sessionVerinfo = this.sessionStorageService.get<VersionInfo2Response>(
       KEY_VER_INFO
     );
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 01e4f721..4dd59dec 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
@@ -238,6 +238,23 @@ export class GroupComponent implements OnInit, OnDestroy {
       'group',
       group
     );
+    switch (menuType) {
+      case 'CHAT':
+        this.store.dispatch(
+          ChatStore.openRoom({ userSeqList: group.userSeqs })
+        );
+        break;
+      case 'SEND_NOTE':
+        break;
+      case 'RENAME':
+        break;
+      case 'EDIT_MEMBER':
+        break;
+      case 'REMOVE':
+        break;
+      default:
+        break;
+    }
   }
 
   onMoreGroup(params: { event: MouseEvent; group: GroupDetailData }) {
diff --git a/projects/ucap-webmessenger-app/src/app/store/messenger/chat/actions.ts b/projects/ucap-webmessenger-app/src/app/store/messenger/chat/actions.ts
index 7ca32baa..d55509ee 100644
--- a/projects/ucap-webmessenger-app/src/app/store/messenger/chat/actions.ts
+++ b/projects/ucap-webmessenger-app/src/app/store/messenger/chat/actions.ts
@@ -34,3 +34,8 @@ export const massTalkDownloadFailure = createAction(
   '[Messenger::Chat] massTalkDownload Failure',
   props<{ error: any }>()
 );
+
+export const openRoom = createAction(
+  '[Messenger::Chat] Open Room',
+  props<{ userSeqList: number[] }>()
+);
diff --git a/projects/ucap-webmessenger-app/src/app/store/messenger/room/actions.ts b/projects/ucap-webmessenger-app/src/app/store/messenger/room/actions.ts
index 39e0df30..c1121182 100644
--- a/projects/ucap-webmessenger-app/src/app/store/messenger/room/actions.ts
+++ b/projects/ucap-webmessenger-app/src/app/store/messenger/room/actions.ts
@@ -9,7 +9,9 @@ import {
   ExitForcingNotification,
   UpdateFontNotification,
   UpdateResponse,
-  UpdateRequest
+  UpdateRequest,
+  OpenRequest,
+  OpenResponse
 } from '@ucap-webmessenger/protocol-room';
 
 export const info = createAction(
@@ -72,3 +74,20 @@ export const updateFailure = createAction(
   '[Messenger::Room] Update Failure',
   props<{ error: any }>()
 );
+
+export const open = createAction(
+  '[Messenger::Room] Open',
+  props<{ req: OpenRequest }>()
+);
+
+export const openSuccess = createAction(
+  '[Messenger::Room] Open Success',
+  props<{
+    res: OpenResponse;
+  }>()
+);
+
+export const openFailure = createAction(
+  '[Messenger::Room] Open Failure',
+  props<{ error: any }>()
+);
diff --git a/projects/ucap-webmessenger-app/src/app/store/messenger/room/effects.ts b/projects/ucap-webmessenger-app/src/app/store/messenger/room/effects.ts
index 8b91b6ea..ea6cca3c 100644
--- a/projects/ucap-webmessenger-app/src/app/store/messenger/room/effects.ts
+++ b/projects/ucap-webmessenger-app/src/app/store/messenger/room/effects.ts
@@ -27,7 +27,8 @@ import {
   SSVC_TYPE_ROOM_INFO_RES,
   UserShortData,
   UserData,
-  UpdateResponse
+  UpdateResponse,
+  OpenResponse
 } from '@ucap-webmessenger/protocol-room';
 
 import * as ChatStore from '@app/store/messenger/chat';
@@ -43,7 +44,10 @@ import {
   updateOnlyAlarm,
   update,
   updateSuccess,
-  updateFailure
+  updateFailure,
+  open,
+  openSuccess,
+  openFailure
 } from './actions';
 import { SessionStorageService } from '@ucap-webmessenger/web-storage';
 import { LoginInfo, KEY_LOGIN_INFO } from '@app/types';
@@ -143,6 +147,30 @@ export class Effects {
     )
   );
 
+  open$ = createEffect(() =>
+    this.actions$.pipe(
+      ofType(open),
+      map(action => action.req),
+      exhaustMap(req => {
+        return this.roomProtocolService.open(req).pipe(
+          map((res: OpenResponse) => {
+            return openSuccess({ res });
+          }),
+          catchError(error => of(openFailure({ error })))
+        );
+      })
+    )
+  );
+
+  openSuccess$ = createEffect(() =>
+    this.actions$.pipe(
+      ofType(openSuccess),
+      map(action => {
+        return ChatStore.selectedRoom({ roomSeq: action.res.roomSeq });
+      })
+    )
+  );
+
   inviteNotification$ = createEffect(
     () => {
       return this.actions$.pipe(
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 e437a975..7cd4fab0 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
@@ -59,6 +59,9 @@ import {
 import { LoginInfo, KEY_LOGIN_INFO } from '@app/types';
 
 import * as ChatStore from '@app/store/messenger/chat';
+import * as RoomStore from '@app/store/messenger/room';
+import { Dictionary } from '@ngrx/entity';
+import { LoginResponse } from '@ucap-webmessenger/protocol-authentication';
 
 @Injectable()
 export class Effects {
@@ -241,6 +244,90 @@ export class Effects {
     { dispatch: false }
   );
 
+  openRoom$ = createEffect(
+    () =>
+      this.actions$.pipe(
+        ofType(ChatStore.openRoom),
+        withLatestFrom(
+          this.store.pipe(
+            select(
+              (state: any) =>
+                state.account.authentication.loginRes as LoginResponse
+            )
+          ),
+          this.store.pipe(
+            select(
+              (state: any) =>
+                state.messenger.sync.roomUser.entities as Dictionary<
+                  RoomUserDetailData
+                >
+            )
+          ),
+          this.store.pipe(
+            select(
+              (state: any) =>
+                state.messenger.sync.roomUserShort.entities as Dictionary<
+                  RoomUserData
+                >
+            )
+          )
+        ),
+        tap(([action, loginRes, roomUsers, roomUserShorts]) => {
+          const userSeqList = [...action.userSeqList, loginRes.userSeq];
+          let roomSeq = null;
+
+          for (const key in roomUsers) {
+            if (roomUsers.hasOwnProperty(key)) {
+              const element = roomUsers[key];
+              if (userSeqList.length === element.userInfos.length) {
+                roomSeq = key;
+                for (const roomUserInfo of element.userInfos) {
+                  if (-1 === userSeqList.indexOf(roomUserInfo.seq)) {
+                    roomSeq = null;
+                    break;
+                  }
+                }
+              }
+            }
+          }
+
+          for (const key in roomUserShorts) {
+            if (roomUserShorts.hasOwnProperty(key)) {
+              const element = roomUserShorts[key];
+              if (userSeqList.length === element.userInfos.length) {
+                roomSeq = key;
+                for (const roomUserDetailData of element.userInfos) {
+                  if (-1 === userSeqList.indexOf(roomUserDetailData.seq)) {
+                    roomSeq = null;
+                    break;
+                  }
+                }
+              }
+            }
+          }
+
+          this.logger.debug(
+            'openRoom',
+            'userSeqList',
+            userSeqList,
+            'roomSeq',
+            roomSeq
+          );
+          if (!!roomSeq) {
+            this.store.dispatch(ChatStore.selectedRoom({ roomSeq }));
+            return;
+          }
+
+          this.store.dispatch(
+            RoomStore.open({
+              req: { divCd: 'DivCode', userSeqs: userSeqList }
+            })
+          );
+        })
+      ),
+    { dispatch: false }
+  );
+
   constructor(
     private actions$: Actions,
     private store: Store<any>,
diff --git a/projects/ucap-webmessenger-ui-group/src/lib/ucap-ui-group.module.ts b/projects/ucap-webmessenger-ui-group/src/lib/ucap-ui-group.module.ts
index 23da00ab..de1174fa 100644
--- a/projects/ucap-webmessenger-ui-group/src/lib/ucap-ui-group.module.ts
+++ b/projects/ucap-webmessenger-ui-group/src/lib/ucap-ui-group.module.ts
@@ -10,16 +10,15 @@ import { MatIconModule } from '@angular/material/icon';
 
 import { ExpansionPanelComponent } from './components/expansion-panel.component';
 import { ExpansionPanelItemDirective } from './directives/expansion-panel-item.directive';
-import { UCapUiProfileModule } from '@ucap-webmessenger/ui-profile';
 
 const COMPONENTS = [ExpansionPanelComponent];
+const DIALOGS = [];
 const DIRECTIVES = [ExpansionPanelItemDirective];
 const SERVICES = [];
 
 @NgModule({
   imports: [
     CommonModule,
-    UCapUiProfileModule,
     ReactiveFormsModule,
     FlexLayoutModule,
     MatButtonModule,
@@ -27,7 +26,8 @@ const SERVICES = [];
     MatIconModule
   ],
   exports: [...COMPONENTS, ...DIRECTIVES],
-  declarations: [...COMPONENTS, ...DIRECTIVES]
+  declarations: [...COMPONENTS, ...DIRECTIVES],
+  entryComponents: []
 })
 export class UCapUiGroupModule {
   public static forRoot(): ModuleWithProviders<UCapUiGroupModule> {
diff --git a/projects/ucap-webmessenger-ui-group/src/public-api.ts b/projects/ucap-webmessenger-ui-group/src/public-api.ts
index af7c2271..a61631d7 100644
--- a/projects/ucap-webmessenger-ui-group/src/public-api.ts
+++ b/projects/ucap-webmessenger-ui-group/src/public-api.ts
@@ -4,4 +4,6 @@
 
 export * from './lib/components/expansion-panel.component';
 
+export * from './lib/directives/expansion-panel-item.directive';
+
 export * from './lib/ucap-ui-group.module';
diff --git a/projects/ucap-webmessenger-ui-room/src/lib/components/list-item.component.ts b/projects/ucap-webmessenger-ui-room/src/lib/components/list-item.component.ts
index c98acf73..5975c2c3 100644
--- a/projects/ucap-webmessenger-ui-room/src/lib/components/list-item.component.ts
+++ b/projects/ucap-webmessenger-ui-room/src/lib/components/list-item.component.ts
@@ -14,6 +14,10 @@ import {
   MassTextInfo
 } from '@ucap-webmessenger/ui-chat';
 import { FileType } from '@ucap-webmessenger/protocol-file';
+import {
+  LoginResponse,
+  UserInfo
+} from '@ucap-webmessenger/protocol-authentication';
 
 @Component({
   selector: 'ucap-room-list-item',
@@ -21,6 +25,9 @@ import { FileType } from '@ucap-webmessenger/protocol-file';
   styleUrls: ['./list-item.component.scss']
 })
 export class ListItemComponent implements OnInit {
+  @Input()
+  loginRes: LoginResponse;
+
   @Input()
   roomInfo: RoomInfo;
   @Input()
@@ -95,13 +102,18 @@ export class ListItemComponent implements OnInit {
 
     if (!!this.roomUserInfo && 0 < this.roomUserInfo.length) {
       let roomName = '';
-      this.roomUserInfo.forEach((roomUserInfo, index) => {
-        if (0 === index) {
-          roomName = roomName.concat('', roomUserInfo.name);
-        } else {
-          roomName = roomName.concat(',', roomUserInfo.name);
+      this.roomUserInfo.forEach(
+        (roomUserInfo: RoomUserInfo | UserInfoShort, index: number) => {
+          if (this.loginRes.userSeq === roomUserInfo.seq) {
+            return;
+          }
+          if ('' === roomName.trim()) {
+            roomName = roomName.concat('', roomUserInfo.name);
+          } else {
+            roomName = roomName.concat(',', roomUserInfo.name);
+          }
         }
-      });
+      );
       return roomName;
     }
   }