Mediation server, communication device, and connecting method

A mediation server for mediating subscription information to a communication device from a network operator providing network connectivity is provided. The server includes a management unit for managing context information of a communication device, which includes data relating to service provided by a network operator; an obtaining unit for obtaining device information of the communication device, which includes data needed to obtain subscription information from a network operator; a selecting unit for selecting, using the context information, a network operator that provides the best service to the communication device out of network operators that are able to provide network connectivity to the communication device; and a request unit for sending a request, with the obtained device information to the selected network operator, for subscription information which is to be used for the communication device to connect to the selected network operator as a home network operator.