diff --git a/src/misc/get-drive-file-url.ts b/src/misc/get-drive-file-url.ts
new file mode 100644
index 000000000..0fe467261
--- /dev/null
+++ b/src/misc/get-drive-file-url.ts
@@ -0,0 +1,20 @@
+import { IDriveFile } from '../models/drive-file';
+import config from '../config';
+
+export default function(file: IDriveFile, thumbnail = false): string {
+	if (file == null) return null;
+
+	if (file.metadata.withoutChunks) {
+		if (thumbnail) {
+			return file.metadata.thumbnailUrl || file.metadata.url;
+		} else {
+			return file.metadata.url;
+		}
+	} else {
+		if (thumbnail) {
+			return `${config.drive_url}/${file._id}?thumbnail`;
+		} else {
+			return `${config.drive_url}/${file._id}`;
+		}
+	}
+}
diff --git a/src/models/drive-file.ts b/src/models/drive-file.ts
index 5e2646a30..57f40be6a 100644
--- a/src/models/drive-file.ts
+++ b/src/models/drive-file.ts
@@ -1,9 +1,9 @@
 import * as mongo from 'mongodb';
 const deepcopy = require('deepcopy');
 import { pack as packFolder } from './drive-folder';
-import config from '../config';
 import monkDb, { nativeDbConn } from '../db/mongodb';
 import isObjectId from '../misc/is-objectid';
+import getDriveFileUrl from '../misc/get-drive-file-url';
 
 const DriveFile = monkDb.get<IDriveFile>('driveFiles.files');
 DriveFile.createIndex('md5');
@@ -33,7 +33,14 @@ export type IMetadata = {
 	thumbnailUrl?: string;
 	src?: string;
 	deletedAt?: Date;
+
+	/**
+	 * このファイルの中身データがMongoDB内に保存されているのか否か
+	 * オブジェクトストレージを利用している or リモートサーバーへの直リンクである
+	 * な場合は false になります
+	 */
 	withoutChunks?: boolean;
+
 	storage?: string;
 	storageProps?: any;
 	isSensitive?: boolean;
@@ -128,8 +135,8 @@ export const pack = (
 
 	_target = Object.assign(_target, _file.metadata);
 
-	_target.url = _file.metadata.url ? _file.metadata.url : `${config.drive_url}/${_target.id}/${encodeURIComponent(_target.name)}`;
-	_target.thumbnailUrl = _file.metadata.thumbnailUrl ? _file.metadata.thumbnailUrl : _file.metadata.url ? _file.metadata.url : `${config.drive_url}/${_target.id}/${encodeURIComponent(_target.name)}?thumbnail`;
+	_target.url = getDriveFileUrl(file);
+	_target.thumbnailUrl = getDriveFileUrl(file, true);
 	_target.isRemote = _file.metadata.isRemote;
 
 	if (_target.properties == null) _target.properties = {};
diff --git a/src/models/user.ts b/src/models/user.ts
index 57973d6ca..ce877fe27 100644
--- a/src/models/user.ts
+++ b/src/models/user.ts
@@ -261,16 +261,6 @@ export const pack = (
 
 	if (_user.avatarUrl == null) {
 		_user.avatarUrl = `${config.drive_url}/default-avatar.jpg`;
-
-		// 互換性のため
-		if (_user.avatarId) {
-			_user.avatarUrl = `${config.drive_url}/${_user.avatarId}`;
-		}
-	}
-
-	// 互換性のため
-	if (_user.bannerId && _user.bannerUrl == null) {
-		_user.bannerUrl = `${config.drive_url}/${_user.bannerId}`;
 	}
 
 	if (!meId || !meId.equals(_user.id) || !opts.detail) {
diff --git a/src/remote/activitypub/models/person.ts b/src/remote/activitypub/models/person.ts
index f115dee87..7842e8788 100644
--- a/src/remote/activitypub/models/person.ts
+++ b/src/remote/activitypub/models/person.ts
@@ -15,6 +15,7 @@ import { URL } from 'url';
 import { resolveNote } from './note';
 import registerInstance from '../../../services/register-instance';
 import Instance from '../../../models/instance';
+import getDriveFileUrl from '../../../misc/get-drive-file-url';
 
 const log = debug('misskey:activitypub');
 
@@ -303,8 +304,8 @@ export async function updatePerson(uri: string, resolver?: Resolver, hint?: obje
 			featured: person.featured,
 			avatarId: avatar ? avatar._id : null,
 			bannerId: banner ? banner._id : null,
-			avatarUrl: (avatar && avatar.metadata.thumbnailUrl) ? avatar.metadata.thumbnailUrl : (avatar && avatar.metadata.url) ? avatar.metadata.url : null,
-			bannerUrl: banner && banner.metadata.url ? banner.metadata.url : null,
+			avatarUrl: getDriveFileUrl(avatar, true),
+			bannerUrl: getDriveFileUrl(banner, true),
 			description: htmlToMFM(person.summary),
 			followersCount,
 			followingCount,
diff --git a/src/remote/activitypub/renderer/document.ts b/src/remote/activitypub/renderer/document.ts
index 1f4543d7e..17721e941 100644
--- a/src/remote/activitypub/renderer/document.ts
+++ b/src/remote/activitypub/renderer/document.ts
@@ -1,8 +1,8 @@
-import config from '../../../config';
 import { IDriveFile } from '../../../models/drive-file';
+import getDriveFileUrl from '../../../misc/get-drive-file-url';
 
 export default (file: IDriveFile) => ({
 	type: 'Document',
 	mediaType: file.contentType,
-	url: file.metadata.url || `${config.drive_url}/${file._id}`
+	url: getDriveFileUrl(file)
 });
diff --git a/src/remote/activitypub/renderer/image.ts b/src/remote/activitypub/renderer/image.ts
index b2f255500..ec637b952 100644
--- a/src/remote/activitypub/renderer/image.ts
+++ b/src/remote/activitypub/renderer/image.ts
@@ -1,8 +1,8 @@
-import config from '../../../config';
 import { IDriveFile } from '../../../models/drive-file';
+import getDriveFileUrl from '../../../misc/get-drive-file-url';
 
 export default (file: IDriveFile) => ({
 	type: 'Image',
-	url: file.metadata.url || `${config.drive_url}/${file._id}`,
+	url: getDriveFileUrl(file),
 	sensitive: file.metadata.isSensitive
 });
diff --git a/src/server/api/endpoints/i/update.ts b/src/server/api/endpoints/i/update.ts
index 7b8431f0e..357b57129 100644
--- a/src/server/api/endpoints/i/update.ts
+++ b/src/server/api/endpoints/i/update.ts
@@ -4,9 +4,9 @@ import { publishMainStream } from '../../../../stream';
 import DriveFile from '../../../../models/drive-file';
 import acceptAllFollowRequests from '../../../../services/following/requests/accept-all';
 import { IApp } from '../../../../models/app';
-import config from '../../../../config';
 import { publishToFollowers } from '../../../../services/i/update';
 import getParams from '../../get-params';
+import getDriveFileUrl from '../../../../misc/get-drive-file-url';
 
 export const meta = {
 	desc: {
@@ -129,7 +129,7 @@ export default async (params: any, user: ILocalUser, app: IApp) => new Promise(a
 		if (avatar == null) return rej('avatar not found');
 		if (!avatar.contentType.startsWith('image/')) return rej('avatar not an image');
 
-		updates.avatarUrl = avatar.metadata.thumbnailUrl || avatar.metadata.url || `${config.drive_url}/${avatar._id}`;
+		updates.avatarUrl = getDriveFileUrl(avatar, true);
 
 		if (avatar.metadata.properties.avgColor) {
 			updates.avatarColor = avatar.metadata.properties.avgColor;
@@ -144,7 +144,7 @@ export default async (params: any, user: ILocalUser, app: IApp) => new Promise(a
 		if (banner == null) return rej('banner not found');
 		if (!banner.contentType.startsWith('image/')) return rej('banner not an image');
 
-		updates.bannerUrl = banner.metadata.url || `${config.drive_url}/${banner._id}`;
+		updates.bannerUrl = getDriveFileUrl(banner, true);
 
 		if (banner.metadata.properties.avgColor) {
 			updates.bannerColor = banner.metadata.properties.avgColor;
@@ -162,7 +162,7 @@ export default async (params: any, user: ILocalUser, app: IApp) => new Promise(a
 
 			if (wallpaper == null) return rej('wallpaper not found');
 
-			updates.wallpaperUrl = wallpaper.metadata.url || `${config.drive_url}/${wallpaper._id}`;
+			updates.wallpaperUrl = getDriveFileUrl(wallpaper);
 
 			if (wallpaper.metadata.properties.avgColor) {
 				updates.wallpaperColor = wallpaper.metadata.properties.avgColor;