PURPOSE: To easily detect the arrival of a call to a terminal equipment even from a noisy location or a location remote from the terminal equipment by allowing the incoming call detector to send a remote signal in a radio channel when the incoming call comes to the terminal equipment and allowing an incoming call display device receiving the signal to light its light emitting section.

CONSTITUTION: An incoming call detector 1 is connected to an idle modular jack MJ to which a telephone set T is connected. On the other hand, an incoming call display device 3 is arranged so as to receive a radio wave sent by the detector 1. When an incoming call signal comes to the telephone set T, the detector 1 detects the incoming call signal and allows its transmission antenna 2 to send a radio wave. The incoming call display device 3 receives the radio wave by its reception antenna 4 and lights its light emitting section 5.