diff --git a/src/apis/base_api.ts b/src/apis/base_api.ts
index 6c348f1..085f157 100644
--- a/src/apis/base_api.ts
+++ b/src/apis/base_api.ts
@@ -1,10 +1,23 @@
 import { Book } from '@models/book.model';
+import { BookSearchPluginSettings } from '@settings/settings';
+import { ServiceProvider } from '@src/constants';
 import { request } from 'obsidian';
+import { GoogleBooksApi } from './google_books_api';
+import { NaverBooksApi } from './naver_books_api';
 
 export interface BaseBooksApiImpl {
   getByQuery(query: string): Promise<Book[]>;
 }
 
+export function getServiceProvider(settings: BookSearchPluginSettings): BaseBooksApiImpl {
+  if (settings.serviceProvider === ServiceProvider.google) {
+    return new GoogleBooksApi();
+  }
+  if (settings.serviceProvider === ServiceProvider.naver) {
+    return new NaverBooksApi(settings.naverClientId, settings.naverClientSecret);
+  }
+}
+
 export class BaseBooksApi implements BaseBooksApiImpl {
   getByQuery(_query: string): Promise<Book[]> {
     throw new Error('Method not implemented.');
diff --git a/src/apis/naver_books_api.ts b/src/apis/naver_books_api.ts
index 9fd2d6d..efde058 100644
--- a/src/apis/naver_books_api.ts
+++ b/src/apis/naver_books_api.ts
@@ -7,6 +7,9 @@ export class NaverBooksApi extends BaseBooksApi {
 
   constructor(private readonly clientId, private readonly clientSecret: string) {
     super();
+    if (!clientId || !clientSecret) {
+      throw new Error('네이버 개발자센터에서 발급받은 `Client ID`와 `Client Secret`이 설정되지 않았습니다.');
+    }
   }
 
   async getByQuery(query: string) {
diff --git a/src/main.ts b/src/main.ts
index eb06a4b..536d733 100644
--- a/src/main.ts
+++ b/src/main.ts
@@ -108,7 +108,7 @@ export default class BookSearchPlugin extends Plugin {
 
   async openBookSearchModal(query = ''): Promise<Book> {
     return new Promise((resolve, reject) => {
-      new BookSearchModal(this.app, query, (error, results) => {
+      new BookSearchModal(this, query, (error, results) => {
         if (error) return reject(error);
         new BookSuggestModal(this.app, results, (error2, selectedBook) => {
           if (error2) return reject(error2);
diff --git a/src/views/book_search_modal.ts b/src/views/book_search_modal.ts
index 711e15a..9f1d6e2 100644
--- a/src/views/book_search_modal.ts
+++ b/src/views/book_search_modal.ts
@@ -1,17 +1,20 @@
-import { App, ButtonComponent, Modal, Setting, TextComponent } from 'obsidian';
-import { GoogleBooksApi } from '@apis/google_books_api';
+import { ButtonComponent, Modal, Setting, TextComponent } from 'obsidian';
 import { Book } from '@models/book.model';
+import { BaseBooksApiImpl, getServiceProvider } from '@apis/base_api';
+import BookSearchPlugin from '@src/main';
 
 export class BookSearchModal extends Modal {
   query: string;
   isBusy: boolean;
   okBtnRef: ButtonComponent;
   onSubmit: (err: Error, result?: Book[]) => void;
+  serviceProvider: BaseBooksApiImpl;
 
-  constructor(app: App, query: string, onSubmit?: (err: Error, result?: Book[]) => void) {
-    super(app);
+  constructor(context: BookSearchPlugin, query: string, onSubmit?: (err: Error, result?: Book[]) => void) {
+    super(context.app);
     this.query = query;
     this.onSubmit = onSubmit;
+    this.serviceProvider = getServiceProvider(context.settings);
   }
 
   async searchBook() {
@@ -24,7 +27,7 @@ export class BookSearchModal extends Modal {
         this.isBusy = true;
         this.okBtnRef.setDisabled(false);
         this.okBtnRef.setButtonText('Requesting...');
-        const searchResults = await new GoogleBooksApi().getByQuery(this.query);
+        const searchResults = await this.serviceProvider.getByQuery(this.query);
 
         this.onSubmit(null, searchResults);
       } catch (err) {