An object of the invention is to provide a charging processing device and a charging processing method capable of performing an appropriate charging process even when a connectionless protocol, such as UDP, is used. Gateway units 101 and 106 transmit data transmitted between a mobile apparatus 300 and a server 400 to the mobile apparatus 300 or the server 400 as a transmission destination, and a charging processing unit 102 performs a charging process according to the amount of data transmitted by the gateway units 101 and 106. A detecting unit 103 detects whether response data is transmitted from the transmission destination. When the timer value of the time for which communication is not performed is more than a predetermined time and the detecting unit 103 does not detect the response data from the transmission destination, the control unit 104 may control the gateway unit 101 or 106 to stop the transmission process and control the charging processing unit 102 to stop the charging process.