A technique is disclosed, according to which the efficiency of a communication channel where the communication is performed between radio communication terminals. According to this technique, under the network condition where different types of connection can be made to different types of networks, radio communication terminals performing communication with each other can perform communication by being connected to the same access network. For instance, by changing the connection of UE_a310a, which performs communication with UE_b310b from eNB 150 to AP b230b, the communication channel of UE_a and UE_b can be changed from a channel 350 to a channel 360. Further, by turning back the channel at PDG 210, for instance, the communication channel can be shortened.