diff --git a/functions/api/routes/auth/authDoorbellGET.js b/functions/api/routes/auth/authDoorbellGET.js
index 264387d..99d8ba6 100644
--- a/functions/api/routes/auth/authDoorbellGET.js
+++ b/functions/api/routes/auth/authDoorbellGET.js
@@ -15,7 +15,7 @@ const { userDB } = require('../../../db');
  */
 
 module.exports = async (req, res) => {
-  const { socialId, fcmToken } = req.query;
+  const { socialId, fcmToken, os } = req.query;
 
   // @error 1. socialId 또는 fcmToken 누락
   if (!socialId || !fcmToken) {
@@ -36,7 +36,13 @@ module.exports = async (req, res) => {
 
     let data = jwtHandlers.sign(user);
     data.isNew = false;
-    await userDB.updateDeviceTokenById(client, user.userId, fcmToken);
+
+    if (!os) {
+      await userDB.updateDeviceTokenById(client, user.userId, fcmToken);
+    } else {
+      await userDB.updateDeviceTokenAndOsById(client, user.userId, fcmToken, os);
+    }
+
     return res.status(statusCode.OK).send(util.success(statusCode.OK, responseMessage.ALREADY_SIGNED_UP, data));
   } catch (error) {
     console.log(error);
diff --git a/functions/db/user.js b/functions/db/user.js
index 113c13f..4541455 100644
--- a/functions/db/user.js
+++ b/functions/db/user.js
@@ -86,6 +86,20 @@ const updateDeviceTokenById = async (client, userId, fcmToken) => {
   return convertSnakeToCamel.keysToCamel(rows[0]);
 };
 
+const updateDeviceTokenAndOsById = async (client, userId, fcmToken, os) => {
+  const now = dayjs().add(9, 'hour');
+  const { rows } = await client.query(
+    `
+    UPDATE spark.user
+    SET device_token = $2, os = $3, updated_at = $4
+    WHERE user_id = $1
+    RETURNING *
+    `,
+    [userId, fcmToken, os, now],
+  );
+  return convertSnakeToCamel.keysToCamel(rows[0]);
+};
+
 const updateProfileById = async (client, userId, nickname, profileImg) => {
   const now = dayjs().add(9, 'hour');
   const { rows } = await client.query(
@@ -129,8 +143,8 @@ const emptyDeviceTokenById = async (client, userId) => {
   return convertSnakeToCamel.keysToCamel(rows[0]);
 };
 
-const deleteUserSoft = async(client, userId, socialId) => {
-  const now = dayjs().add(9,'hour');
+const deleteUserSoft = async (client, userId, socialId) => {
+  const now = dayjs().add(9, 'hour');
   const nowToString = now.format('YYYYMMDDHHmmssSSS');
   const newSocialId = `${socialId}-out-${nowToString}`;
   const { rows } = await client.query(
@@ -143,7 +157,7 @@ const deleteUserSoft = async(client, userId, socialId) => {
     [userId, now, newSocialId],
   );
   return convertSnakeToCamel.keysToCamel(rows[0]);
-}
+};
 
 module.exports = {
   getAllUsers,
@@ -152,6 +166,7 @@ module.exports = {
   getUserBySocialId,
   addUser,
   updateDeviceTokenById,
+  updateDeviceTokenAndOsById,
   updateProfileById,
   togglePushSettingById,
   getUserWithDelete,