A method of a second terminal for sharing a use authority of a service allowed by a first user of a first terminal is provided. The method includes requesting an authorization server for authentication information of the service, wherein the authorization server stores identification information of a second user with whom the use authority is sharable and a validity period during which the use authority is shared with the second user, when a user of the second terminal corresponds to the second user, receiving the authentication information from the authorization server, and, receiving the use authority of the service during the validity period.