To solve the problems that may occur due to the leakage of user account information, the present disclosure may manage the security using the device token that is used independently of that of the server, that is generated by a home device, and that can be used for device authentication when a smart phone controls home appliances. With the use of the device token, the present disclosure may solve the problems that the status information of home appliances is exposed by another person or the home appliances are controlled by another person, even though the user account information is leaked.