The invention is to solve a problem such that a server application that a secure device has cannot be used by a client application that a different secure device has.A secure device according the invention has an application storage section 202 for storing a client application of an application for performing data processing; an address calculation section 205 for determining whether or not the application storage section 202 has a server application for transferring data to and from the client application; and a referent existence determination section 210, when the address calculation section 205 determines that the application storage section 202 does not have a first server application for transferring data to and from a first client application, for determining whether or not a different secure device has the first server application.