An object is to provide an incoming-call number notification apparatus capable of notifying a user of the number of incoming calls at the present moment by using simpler equipment. An incoming-call number notification apparatus according to the present invention includes a control unit (14, 15) configured to, when there is an incoming call to a plurality of telephones (20) accommodated in an exchange (10), determine a display color according to the number of incoming calls at the present moment, and instruct the plurality of telephones to blink or light up an incoming-call lamp of its own telephone in the determined display color (20).
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