In a system in which a wireless access network and another network are connected to each other, an accurate fee is charged in a case where data held in an application server disposed in the wireless access network is used.The application server holds an application and data relating to the application. A usage mode information generating unit generates usage mode information which is information relating to a usage mode when the wireless terminal uses the held data. A network data usage amount measuring unit measures a network data usage amount when the wireless terminal uses data on another network via a wireless access network connected to the wireless terminal. A fee charging unit charges a fee on the basis of the measured network data usage amount and charge a fee on a basis of the generated usage mode information.