The communication processing method is used in a network gateway device, wherein the network gateway device is coupled to a wireless terminal through a first wireless network and to a base station through a second wireless network different from the first wireless network. The method maintains a first TCP link between the network gateway device and the wireless terminal through the first wireless network; maintains a second TCP link between the network gateway device and a service providing server through the second wireless network; and performs a TCP transmission optimization on the first TCP link or the second TCP link to be optimized by a corresponding optimization method so as to improve a transmission performance between the wireless terminal and the service providing server. The optimization may be performed more specifically and a transmission performance between the wireless terminal and the service providing server may be improved.