diff --git a/projects/ucap-webmessenger-app/src/app/layouts/messenger/components/left-side.component.ts b/projects/ucap-webmessenger-app/src/app/layouts/messenger/components/left-side.component.ts
index 97bdd7e5..7dca715b 100644
--- a/projects/ucap-webmessenger-app/src/app/layouts/messenger/components/left-side.component.ts
+++ b/projects/ucap-webmessenger-app/src/app/layouts/messenger/components/left-side.component.ts
@@ -10,6 +10,7 @@ import { Observable } from 'rxjs';
 import { Store, select } from '@ngrx/store';
 
 import * as AppStore from '@app/store';
+import * as ChatStore from '@app/store/messenger/chat';
 
 @Component({
   selector: 'app-layout-messenger-left-side',
@@ -45,11 +46,14 @@ export class LeftSideComponent implements OnInit {
       }
     });
 
-    this.logger.debug(result.choice);
-    // if (result.choice) {
+    if (!!result && !!result.choice && result.choice) {
+      this.logger.debug(result.selectedUserList);
+      if (!!result.selectedUserList && result.selectedUserList.length > 0) {
+        const userSeqs: number[] = [];
+        result.selectedUserList.map(user => userSeqs.push(user.seq));
 
-    // } else {
-
-    // }
+        this.store.dispatch(ChatStore.openRoom({ userSeqList: userSeqs }));
+      }
+    }
   }
 }
diff --git a/projects/ucap-webmessenger-app/src/app/layouts/messenger/components/left-sidenav/organization.component.html b/projects/ucap-webmessenger-app/src/app/layouts/messenger/components/left-sidenav/organization.component.html
index e1c70420..29245154 100644
--- a/projects/ucap-webmessenger-app/src/app/layouts/messenger/components/left-sidenav/organization.component.html
+++ b/projects/ucap-webmessenger-app/src/app/layouts/messenger/components/left-sidenav/organization.component.html
@@ -1,28 +1,19 @@
-<div
-  class="oraganization-tab"
-  fxLayout="column"
-  *ngIf="departmentInfoList$ | async"
->
+<div class="oraganization-tab" fxLayout="column" *ngIf="departmentInfoList$ | async">
   <div class="oraganization-tab-tree" fxFlex="50" style="overflow: scroll">
-    <ucap-organization-tree
-      [oraganizationList]="departmentInfoList$ | async"
-      (selected)="onSelectedOrganization($event)"
-    ></ucap-organization-tree>
+    <ucap-organization-tree [oraganizationList]="departmentInfoList$ | async"
+      (selected)="onSelectedOrganization($event)"></ucap-organization-tree>
   </div>
   <div fxFlex="50" style="overflow: scroll">
     <div>
       (선택된부서명)
     </div>
     <div>
-      <ucap-profile-user-list-item
-        *ngFor="let userInfo of selectedDepartmentUserInfoList$ | async"
-        [userInfo]="userInfo"
-        [checkable]="true"
-        [sessionVerinfo]="sessionVerinfo"
-      >
+      <ucap-profile-user-list-item *ngFor="let userInfo of selectedDepartmentUserInfoList$ | async"
+        [userInfo]="userInfo" [checkable]="true" [sessionVerinfo]="sessionVerinfo" [selectedUserList]="selectedUserList"
+        [isChecked]="getCheckedUser(userInfo)" (checkUser)="onCheckUser($event)">
       </ucap-profile-user-list-item>
     </div>
-    <div>
+    <div *ngIf="!isUserSelect">
       (하단버튼영역)
     </div>
   </div>
diff --git a/projects/ucap-webmessenger-app/src/app/layouts/messenger/components/left-sidenav/organization.component.ts b/projects/ucap-webmessenger-app/src/app/layouts/messenger/components/left-sidenav/organization.component.ts
index 06cecc51..625e42c7 100644
--- a/projects/ucap-webmessenger-app/src/app/layouts/messenger/components/left-sidenav/organization.component.ts
+++ b/projects/ucap-webmessenger-app/src/app/layouts/messenger/components/left-sidenav/organization.component.ts
@@ -1,4 +1,4 @@
-import { Component, OnInit } from '@angular/core';
+import { Component, OnInit, Output, EventEmitter, Input } from '@angular/core';
 import { ucapAnimations } from '@ucap-webmessenger/ui';
 import { Observable } from 'rxjs';
 import {
@@ -6,8 +6,11 @@ import {
   QueryProtocolService,
   DeptSearchType,
   UserInfoSS,
-  DeptUserResponse
+  DeptUserResponse,
+  UserInfoF,
+  UserInfoDN
 } from '@ucap-webmessenger/protocol-query';
+import { UserInfo } from '@ucap-webmessenger/protocol-sync';
 import { Store, select } from '@ngrx/store';
 import { NGXLogger } from 'ngx-logger';
 
@@ -26,6 +29,19 @@ import { KEY_VER_INFO } from '@app/types/ver-info.type';
   animations: ucapAnimations
 })
 export class OrganizationComponent implements OnInit {
+  @Input()
+  /** 사용자 선택용으로 사용시 true 로 유입 */
+  isUserSelect = false;
+  @Input()
+  /** 선택된 사용자의 리스트 */
+  selectedUserList?: (UserInfo | UserInfoSS | UserInfoF | UserInfoDN)[] = [];
+
+  @Output()
+  checkUser = new EventEmitter<{
+    isChecked: boolean;
+    userInfo: UserInfo | UserInfoSS | UserInfoF | UserInfoDN;
+  }>();
+
   departmentInfoList$: Observable<DeptInfo[]>;
   selectedDepartmentUserInfoList$: Observable<UserInfoSS[]>;
   selectedDepartmentStatus$: Observable<DeptUserResponse>;
@@ -97,4 +113,24 @@ export class OrganizationComponent implements OnInit {
       )
       .subscribe();
   }
+
+  /** 리스트 checkable 할 경우 checkbox 의 isChecked 를 관장하며 리스트의 전체선택 여부를 판단한다. */
+  getCheckedUser(userInfo: UserInfo | UserInfoSS | UserInfoF | UserInfoDN) {
+    if (!!this.selectedUserList && this.selectedUserList.length > 0) {
+      return (
+        this.selectedUserList.filter(item => item.seq === userInfo.seq).length >
+        0
+      );
+    }
+    return false;
+  }
+
+  /** 리스트가 checkable 할 경우 checkbox 의 change 이벤트를 상위 컴포넌트로 전달한다. */
+  onCheckUser(params: {
+    isChecked: boolean;
+    userInfo: UserInfo | UserInfoSS | UserInfoF | UserInfoDN;
+  }) {
+    console.log(this.selectedUserList);
+    this.checkUser.emit(params);
+  }
 }
diff --git a/projects/ucap-webmessenger-app/src/app/layouts/messenger/dialogs/chat/create-chat.dialog.component.html b/projects/ucap-webmessenger-app/src/app/layouts/messenger/dialogs/chat/create-chat.dialog.component.html
index 8e632e65..660361bc 100644
--- a/projects/ucap-webmessenger-app/src/app/layouts/messenger/dialogs/chat/create-chat.dialog.component.html
+++ b/projects/ucap-webmessenger-app/src/app/layouts/messenger/dialogs/chat/create-chat.dialog.component.html
@@ -13,9 +13,11 @@
           <ucap-organization-tenant-search [companyList]="companyList$ | async" [companyCode]="companyCode"
             (keyDownEnter)="onKeyDownEnterOrganizationTenantSearch($event)"></ucap-organization-tenant-search>
           <ucap-group-expansion-panel #groupExpansionPanel [groupBuddyList]="groupBuddyList$ | async"
-            [favoritBuddyList]="favoritBuddyList$ | async" [checkable]="true" (checkGroup)="onCheckGroup($event)">
+            [favoritBuddyList]="favoritBuddyList$ | async" [selectedUserList]="selectedUserList" [checkable]="true"
+            (checkGroup)="onCheckGroup($event)">
             <ucap-profile-user-list-item *ucapGroupExpansionPanelItem="let userInfo" [userInfo]="userInfo"
-              [sessionVerinfo]="sessionVerinfo" (checkUser)="onCheckUser($event)" [checkable]="true">
+              [sessionVerinfo]="sessionVerinfo" [selectedUserList]="selectedUserList"
+              [isChecked]="getCheckedUser(userInfo)" [checkable]="true" (checkUser)="onCheckUser($event)">
             </ucap-profile-user-list-item>
           </ucap-group-expansion-panel>
         </mat-tab>
@@ -23,7 +25,9 @@
           <ng-template mat-tab-label>
             <mat-icon>device_hub</mat-icon>
           </ng-template>
-          <app-layout-chat-left-sidenav-organization></app-layout-chat-left-sidenav-organization>
+          <app-layout-chat-left-sidenav-organization [selectedUserList]="selectedUserList" [isUserSelect]="true"
+            (checkUser)="onCheckUser($event)">
+          </app-layout-chat-left-sidenav-organization>
         </mat-tab>
         <mat-tab>
           <ng-template mat-tab-label>
diff --git a/projects/ucap-webmessenger-app/src/app/layouts/messenger/dialogs/chat/create-chat.dialog.component.ts b/projects/ucap-webmessenger-app/src/app/layouts/messenger/dialogs/chat/create-chat.dialog.component.ts
index f6a36312..34841844 100644
--- a/projects/ucap-webmessenger-app/src/app/layouts/messenger/dialogs/chat/create-chat.dialog.component.ts
+++ b/projects/ucap-webmessenger-app/src/app/layouts/messenger/dialogs/chat/create-chat.dialog.component.ts
@@ -38,6 +38,7 @@ export interface CreateChatDialogData {
 
 export interface CreateChatDialogResult {
   choice: boolean;
+  selectedUserList?: (UserInfo | UserInfoSS | UserInfoF | UserInfoDN)[];
 }
 
 @Component({
@@ -197,6 +198,7 @@ export class CreateChatDialogComponent implements OnInit, OnDestroy {
     );
   }
 
+  /** 동료그룹 :: 그룹의 checkbox 의 이벤트를 받아 선택된 유저리스트를 수집. */
   onCheckGroup(params: {
     isChecked: boolean;
     groupBuddyList: { group: GroupDetailData; buddyList: UserInfo[] };
@@ -207,7 +209,7 @@ export class CreateChatDialogComponent implements OnInit, OnDestroy {
           this.selectedUserList.filter(user => user.seq === item.seq).length ===
           0
         ) {
-          this.selectedUserList.push(item);
+          this.selectedUserList = [...this.selectedUserList, item];
         }
       });
     } else {
@@ -219,6 +221,7 @@ export class CreateChatDialogComponent implements OnInit, OnDestroy {
     }
   }
 
+  /** 동료그룹>부서원, 조직도>부서원 :: 리스트의 checkbox 의 이벤트를 받아 선택된 유저리스트를 수집. */
   onCheckUser(params: {
     isChecked: boolean;
     userInfo: UserInfo | UserInfoSS | UserInfoF | UserInfoDN;
@@ -226,9 +229,10 @@ export class CreateChatDialogComponent implements OnInit, OnDestroy {
     if (params.isChecked) {
       if (
         this.selectedUserList.filter(user => user.seq === params.userInfo.seq)
-          .length === 0
+          .length === 0 &&
+        params.userInfo
       ) {
-        this.selectedUserList.push(params.userInfo);
+        this.selectedUserList = [...this.selectedUserList, params.userInfo];
       }
     } else {
       this.selectedUserList = this.selectedUserList.filter(
@@ -237,9 +241,22 @@ export class CreateChatDialogComponent implements OnInit, OnDestroy {
     }
   }
 
+  /** 그룹>부서원 리스트의 ischecked 를 판단. */
+  getCheckedUser(userInfo: UserInfo | UserInfoSS | UserInfoF | UserInfoDN) {
+    if (!!this.selectedUserList && this.selectedUserList.length > 0) {
+      return (
+        this.selectedUserList.filter(item => item.seq === userInfo.seq).length >
+        0
+      );
+    }
+    return false;
+  }
+
+  /** 팝업의 선택 이벤트 전달. */
   onClickChoice(choice: boolean): void {
-    // this.dialogRef.close({
-    //   choice
-    // });
+    this.dialogRef.close({
+      choice,
+      selectedUserList: this.selectedUserList
+    });
   }
 }
diff --git a/projects/ucap-webmessenger-ui-group/src/lib/components/expansion-panel.component.html b/projects/ucap-webmessenger-ui-group/src/lib/components/expansion-panel.component.html
index 8ec6f550..76af2331 100644
--- a/projects/ucap-webmessenger-ui-group/src/lib/components/expansion-panel.component.html
+++ b/projects/ucap-webmessenger-ui-group/src/lib/components/expansion-panel.component.html
@@ -28,8 +28,8 @@
           (click)="onClickMore($event, groupBuddy.group)">
           <mat-icon>more_vert</mat-icon>
         </button>
-        <mat-checkbox *ngIf="checkable" #checkbox (change)="onChangeCheck(checkbox.checked, groupBuddy)"
-          (click)="$event.stopPropagation()"></mat-checkbox>
+        <mat-checkbox *ngIf="checkable" #checkbox [checked]="getCheckedGroup(groupBuddy)"
+          (change)="onChangeCheck(checkbox.checked, groupBuddy)" (click)="$event.stopPropagation()"></mat-checkbox>
       </mat-panel-description>
     </mat-expansion-panel-header>
 
diff --git a/projects/ucap-webmessenger-ui-group/src/lib/components/expansion-panel.component.ts b/projects/ucap-webmessenger-ui-group/src/lib/components/expansion-panel.component.ts
index a4143cf4..8a48c64f 100644
--- a/projects/ucap-webmessenger-ui-group/src/lib/components/expansion-panel.component.ts
+++ b/projects/ucap-webmessenger-ui-group/src/lib/components/expansion-panel.component.ts
@@ -14,6 +14,11 @@ import { ucapAnimations } from '@ucap-webmessenger/ui';
 import { GroupDetailData, UserInfo } from '@ucap-webmessenger/protocol-sync';
 import { MatAccordion } from '@angular/material';
 import { ExpansionPanelItemDirective } from '../directives/expansion-panel-item.directive';
+import {
+  UserInfoSS,
+  UserInfoF,
+  UserInfoDN
+} from '@ucap-webmessenger/protocol-query';
 
 @Component({
   selector: 'ucap-group-expansion-panel',
@@ -24,12 +29,13 @@ import { ExpansionPanelItemDirective } from '../directives/expansion-panel-item.
 export class ExpansionPanelComponent implements OnInit {
   @Input()
   groupBuddyList: { group: GroupDetailData; buddyList: UserInfo[] }[];
-
   @Input()
   favoritBuddyList: UserInfo[];
-
   @Input()
   checkable = false;
+  @Input()
+  /** 선택된 사용자의 리스트 */
+  selectedUserList?: (UserInfo | UserInfoSS | UserInfoF | UserInfoDN)[] = [];
 
   @Output()
   more = new EventEmitter<{
@@ -67,6 +73,7 @@ export class ExpansionPanelComponent implements OnInit {
     this.more.emit({ event, group });
   }
 
+  /** 그룹리스트가 checkable 할 경우 checkbox 의 change 이벤트를 상위 컴포넌트로 전달한다. */
   onChangeCheck(
     value: boolean,
     groupBuddyList: { group: GroupDetailData; buddyList: UserInfo[] }
@@ -76,4 +83,28 @@ export class ExpansionPanelComponent implements OnInit {
       groupBuddyList
     });
   }
+
+  /** 그룹리스트가 checkable 할 경우 checkbox 의 isChecked 를 관장하며, 하위 부서원들의 전체선택여부를 판단한다. */
+  getCheckedGroup(groupBuddy: {
+    group: GroupDetailData;
+    buddyList: UserInfo[];
+  }) {
+    if (groupBuddy.buddyList.length === 0) {
+      return false;
+    }
+    if (!!this.selectedUserList && this.selectedUserList.length > 0) {
+      let allExist = true;
+      groupBuddy.buddyList.some(groupUser => {
+        if (
+          this.selectedUserList.filter(item => item.seq === groupUser.seq)
+            .length === 0
+        ) {
+          allExist = false;
+          return true;
+        }
+      });
+      return allExist;
+    }
+    return false;
+  }
 }
diff --git a/projects/ucap-webmessenger-ui-profile/src/lib/components/user-list-item.component.ts b/projects/ucap-webmessenger-ui-profile/src/lib/components/user-list-item.component.ts
index dc882336..1ae14b37 100644
--- a/projects/ucap-webmessenger-ui-profile/src/lib/components/user-list-item.component.ts
+++ b/projects/ucap-webmessenger-ui-profile/src/lib/components/user-list-item.component.ts
@@ -48,6 +48,9 @@ export class UserListItemComponent implements OnInit, OnDestroy {
   compactable = false;
   @Input()
   sessionVerinfo: VersionInfo2Response;
+  @Input()
+  /** 선택된 사용자의 리스트 */
+  selectedUserList?: (UserInfo | UserInfoSS | UserInfoF | UserInfoDN)[] = [];
 
   @Output()
   checkUser = new EventEmitter<{
@@ -115,6 +118,7 @@ export class UserListItemComponent implements OnInit, OnDestroy {
     return rtnClass;
   }
 
+  /** 리스트가 checkable 할 경우 checkbox 의 change 이벤트를 상위 컴포넌트로 전달한다. */
   onChangeCheck(
     value: boolean,
     userInfo: UserInfo | UserInfoSS | UserInfoF | UserInfoDN