A wireless terminal device includes: a transmission control unit which transmits a transfer request which is for requesting a use right of contract authentication information relating to a wireless business operator providing wireless connection services, which is information held by a second wireless terminal device as another wireless terminal device, via a wireless line when a predetermined operation is input; a receiving unit which receives transfer information which is transmitted via the wireless line in response to the transfer request for transferring the use right; and a control unit which sets valid contract authentication information based on the received transfer information.