Patent attributes
A service providing device includes a requesting unit for receiving, from the device operated by a user, a request for a process of using a service providing system having a different authentication base, and making a request to acquire authorization information for using the service providing system; a substitute authentication unit for acquiring authentication information of the service providing system from a second storage when the authorization information associated with the user is not stored in a first storage, and acquiring the authorization information from the service providing system by using the authentication information; and a providing unit for providing the authorization information stored in the first storage when the authorization information associated with the user is stored in the first storage, and providing the authorization information acquired from the service providing system when the authorization information associated with the user is not stored in the first storage.