Patent ID: 7684417

Claim:
A network system comprising: connection control means for controlling the switching of the connection destination of a terminal; first and second servers belonging to first and second different networks, respectively and connected to the terminal, respectively through the first and second networks; operating server-switching control means for migrating a process from the first server to the second server; and server/network cooperation control means having a storage unit for storing the information of the first and second servers and the information of the second network, and connected to the operating server-switching control means and to the connection control means, wherein the server/network cooperation control means comprises information processing means for executing processing for receiving a process migration request from the first server to the second server and sending a migration start request including the information of the second server as a migration destination stored in the storage unit to the operating server-switching control means, and processing for receiving a target process migration completion notification from the operating server-switching control means and, thereafter, sending a switching request from the first network to the second network to the connection control means, the switching request including the information of the second network stored in the storage unit, and the connection control means and the first and second servers execute communication using a transport level protocol.