This invention includes an application server for executing an application and transmitting the execution results to a terminal or other such device connected to a network, and a management server for allocating the application and data on an application server and a storage device, respectively, wherein the management server reallocates the application execution site using: a procedure for obtaining device location information from a device via an application server and selecting, from the location information, an application server that will be the application migration destination; a procedure for indicating the migration-destination application server to the migration-source application server; and a procedure for migrating the application and the data between the application servers.