A portable terminal comprising a transmission part that transmits to information provision equipment or a server, a signal indicating presence at a prescribed location, presence of a communications counterparty at a prescribed location, a reception part that receives from the information provision equipment or the server, a signal indicating the position of a moving body, a moving body is approaching or is present at the prescribed location, an alarm part that issues an alarm using the moving body in position signal received at the reception part, indicating the moving body is approaching or is present at the prescribed location, a light detection part detecting the degree of brightness, a part deciding whether or not to transmit a present in prescribed location signal that decides, using the brightness as detected by the light detection part, whether or not to send a present in prescribed location signal from the transmission part.