A portable terminal device includes a first radio communication part provided in the device for performing a wireless communication with a first network and a second radio communication part built in the device for performing a wireless communication with a second network. The portable terminal device further includes a control part for, upon reception of an incoming call request from the first network, selecting an apparatus from apparatuses which have established communications over the second network with the second radio communication part, in accordance with a predetermined order of priority and a communication adapting part for establishing a communication between the selected apparatus and the first network.