diff --git a/projects/ucap-webmessenger-app/src/app/layouts/messenger/dialogs/group/select-group.dialog.component.html b/projects/ucap-webmessenger-app/src/app/layouts/messenger/dialogs/group/select-group.dialog.component.html
index 3f05fc2b..52539aec 100644
--- a/projects/ucap-webmessenger-app/src/app/layouts/messenger/dialogs/group/select-group.dialog.component.html
+++ b/projects/ucap-webmessenger-app/src/app/layouts/messenger/dialogs/group/select-group.dialog.component.html
@@ -34,7 +34,6 @@
               value=""
               formControlName="groupName"
             />
-
             <button
               mat-button
               matSuffix
@@ -44,10 +43,22 @@
             >
               <mat-icon>close</mat-icon>
             </button>
-
             <mat-hint align="end"
               >{{ inputGroupName.value?.length || 0 }}/20</mat-hint
             >
+            <mat-error
+              *ngIf="inputForm.get('groupName').hasError('groupNameBanned')"
+            >
+              {{
+                'group.errors.bannedWords'
+                  | translate: { bannedWords: bannedWords.join(',') }
+              }}
+            </mat-error>
+            <mat-error
+              *ngIf="inputForm.get('groupName').hasError('groupNameSamed')"
+            >
+              {{ 'group.errors.sameNameExist' | translate }}
+            </mat-error>
           </mat-form-field>
         </form>
 
diff --git a/projects/ucap-webmessenger-app/src/app/layouts/messenger/dialogs/group/select-group.dialog.component.ts b/projects/ucap-webmessenger-app/src/app/layouts/messenger/dialogs/group/select-group.dialog.component.ts
index e32b0ea7..a19855bc 100644
--- a/projects/ucap-webmessenger-app/src/app/layouts/messenger/dialogs/group/select-group.dialog.component.ts
+++ b/projects/ucap-webmessenger-app/src/app/layouts/messenger/dialogs/group/select-group.dialog.component.ts
@@ -5,7 +5,7 @@ import {
   MatSelectionList,
   MatSelectionListChange
 } from '@angular/material';
-import { Observable, combineLatest } from 'rxjs';
+import { Observable, combineLatest, Subscription } from 'rxjs';
 import { Store, select } from '@ngrx/store';
 import { map, take } from 'rxjs/operators';
 
@@ -20,8 +20,14 @@ import {
 } from '@ucap-webmessenger/ui';
 import { GroupDetailData, UserInfo } from '@ucap-webmessenger/protocol-sync';
 import { environment } from '../../../../../environments/environment';
-import { TranslateService } from '@ngx-translate/core';
-import { FormGroup, FormBuilder, Validators } from '@angular/forms';
+import { TranslateService, TranslateParser } from '@ngx-translate/core';
+import {
+  FormGroup,
+  FormBuilder,
+  Validators,
+  ValidatorFn,
+  AbstractControl
+} from '@angular/forms';
 import { StringUtil } from '@ucap-webmessenger/core';
 
 export interface SelectGroupDialogData {
@@ -43,6 +49,10 @@ export class SelectGroupDialogComponent implements OnInit {
   groupName: string;
   inputForm: FormGroup;
 
+  bannedWords: string[] = [];
+  groupListSubscription: Subscription;
+  groupList: GroupDetailData[];
+
   constructor(
     public dialogRef: MatDialogRef<
       SelectGroupDialogData,
@@ -52,8 +62,34 @@ export class SelectGroupDialogComponent implements OnInit {
     private store: Store<any>,
     private dialogService: DialogService,
     private translateService: TranslateService,
+    private translateParser: TranslateParser,
     private formBuilder: FormBuilder
-  ) {}
+  ) {
+    const banKeys: string[] = [
+      'group.nameFavorite',
+      'group.nameMyDept',
+      'group.nameDefault'
+    ];
+
+    const langs = ['ko', 'en'];
+
+    langs.forEach(lang => {
+      this.translateService
+        .getTranslation(lang)
+        .pipe(take(1))
+        .subscribe(
+          translation => {
+            banKeys.forEach(banKey => {
+              this.bannedWords.push(
+                this.translateParser.getValue(translation, banKey)
+              );
+            });
+          },
+          error => {},
+          () => {}
+        );
+    });
+  }
 
   @ViewChild('groups', { static: true }) groups: MatSelectionList;
   groupBuddyList$: Observable<
@@ -64,7 +100,15 @@ export class SelectGroupDialogComponent implements OnInit {
 
   ngOnInit(): void {
     this.inputForm = this.formBuilder.group({
-      groupName: ['', [Validators.required, StringUtil.checkSpecialCharacter()]]
+      groupName: [
+        '',
+        [
+          Validators.required,
+          StringUtil.checkSpecialCharacter(),
+          this.checkBanWords(),
+          this.checkSameName()
+        ]
+      ]
     });
 
     this.groups.selectionChange.subscribe((s: MatSelectionListChange) => {
@@ -82,6 +126,8 @@ export class SelectGroupDialogComponent implements OnInit {
       )
     ]).pipe(
       map(([buddyList, groupList]) => {
+        this.groupList = groupList;
+
         // sort..
         if (!!groupList && groupList.length > 0) {
           const tempOrderArr: GroupDetailData[] = [];
@@ -214,4 +260,31 @@ export class SelectGroupDialogComponent implements OnInit {
     }
     return false;
   }
+
+  checkBanWords(): ValidatorFn {
+    return (control: AbstractControl): { [key: string]: any } | null => {
+      if (!control || !control.value) {
+        return null;
+      }
+      const ban =
+        -1 < this.bannedWords.indexOf((control.value as string).trim());
+      return ban ? { groupNameBanned: { value: control.value } } : null;
+    };
+  }
+
+  checkSameName(): ValidatorFn {
+    return (control: AbstractControl): { [key: string]: any } | null => {
+      if (
+        !control ||
+        !control.value ||
+        !this.groupList ||
+        0 === this.groupList.length
+      ) {
+        return null;
+      }
+      const v = (control.value as string).trim();
+      const ban = -1 < this.groupList.findIndex(g => g.name === v);
+      return ban ? { groupNameSamed: { value: control.value } } : null;
+    };
+  }
 }