Patent ID: 8036662

Claim:
A server connected to a network in a wireless communication system including a mobile terminal with wireless interfaces, access points each communicating with the mobile terminal through one of the wireless interfaces so as to be connected to the network, and wireless network gateways each having one side connected to the server and the other side connected to corresponding one of the access points, the server comprising: a communication unit for wirelessly communicating with the mobile terminal through one of the wireless network gateways and one of the access point; a table for storing registration information of the mobile terminal and an identifier indicating through which wireless interface of the mobile terminal registration request information is transmitted; and a processing unit for receiving registration request information from the mobile terminal through the communication unit to execute switching of the wireless network gateway used for communicating with the mobile terminal generating, when the registration request information includes an instruction of extended options for instructing termination of the wireless connection before executing said switching, a signal instructing the termination of connection between the mobile terminal and the wireless network gateway before executing said switching by referring to the identifier stored in the table and information to send the generated signal to the wireless network gateway before executing said switching through the communication unit to release the wireless connection between the mobile terminal and the wireless network gateway before executing said switching.