A telephone device which enables a user to consciously send a determined present position to a device in the surrounding area is provided. A portable telephone device 10 sends position determination information acquired by a GPS unit including a GPS antenna 31 and/or a portable telephone signal position determination processing unit including a portable telephone communication antenna 21, to another portable telephone device 50 as a desired communicating party via a base station by using a data communication function in accordance with a decision operation of a POS button 17a. Another portable telephone device 50 displays a map image of the vicinity of the received position determination information on an LCD display unit 52 by using an embedded digital map display application or the like, and also displays a present position point 53 of the portable telephone device 10 on the map image.