Abstract: In operation of a conventional vertical integration system a primary user cannot provide services to a secondary user belonging to other service group. An identification managing server is proposed to carry out the retrieval of a master-slave relation information by using common identification information as a key and outputs an assurance including its result when the identification managing server receives an assurance request output from a first judgment server at a request of a second judgment server from a first electronic device used by a primary user. Further, the first judgment server outputs an assured service based on such assurance to the second judgment server in order for the primary user to have services from the other vertical integration system to which the secondary user belongs.

Abstract: In the conventional vertical integration system management form, it is impossible or difficult to limit the electronic device function or format when providing a service to an electronic device which is judged by a judgment server of an administrator of the service providing system with whom a service provider has not concluded a contract. To cope with this, a following system is suggested. That is, according to a use request from a first electronic device to a second judgment server, an identification management server which has received a guarantee request outputted from a first judgment server searches an identification management unit for managing information including the electronic device identifiers. According to the search result, a guarantee is outputted. According to the guarantee, the first judgment server outputs a guaranteed service request to the second judgment server.

Abstract: The conventional vertical integration system management form has a problem that a first user cannot receive a service provided by a second user belonging to another service system. To cope with this, a following system is suggested. That is, according to a second judgment server use request from a first electronic device used by a first user, an identification management server which has received a guarantee request outputted from a first judgment server searches for master-slave relationship information based on a common identifier. According to the search result, a guarantee is outputted. According to the guarantee, the first judgment server outputs a guaranteed service request to the second judgment server. Thus, the first user can receive the service used by the second user belonging to other vertical integration type system.