Provided is an application filtering apparatus for controlling session, which is coupled to a network which is coupled to a plurality of terminal devices, a first server for managing subscriber information of the terminal devices, and a second server for providing a service to the terminal devices, the application filtering apparatus comprising: an interface coupled to the network; a processor coupled to the memory; and a memory coupled to the processor, wherein the application filtering apparatus is configured to: obtain the subscriber information from the first server; obtain, when one of the terminal devices sends a session control message to the second server, an identifier of the terminal device that has sent from the received session control message; and send, based on the obtained subscriber information and the obtained identifier of the terminal device, an instruction to control the service to the second server via the interface.