A DL resource control section 203 controls the status of communication resource assignment of a direct link type network. An MS resource control section 204 controls the status of communication resource assignment of a master-slave type network. When carrying out communications between terminal apparatus held in different networks, a transmission resource assigning section 205 refers to the status of communication resource assignment of the two networks controlled by the DL resource control section 203 and the MS resource control section 204 and assigns the same communication resources to both terminal apparatus of a transmitting side and a receiving side. Thus, the communication resources can be utilized effectively when carrying out communications between the terminal apparatus held in different networks respectively.