A service providing method using profile information and a system thereof is provided. According to the invention, in order to provide profile information for serving a user to a service provider at a place other than a home, a user device, an external device, an authentication server and a profile server are provided and interconnected through a network such as the Internet. Accordingly, the service provider can provide the best services to users, and users can be provided with services that are the same as those provided at home.