To notify an apparatus for executing processing according to a connection request of information to be notified, without making a human clearly perceive the information to be notified.

A communication system 10 comprises: a sound emitting terminal 100; mobile communication terminals 200a and 200b; and a communication terminal 300. The communication terminal 300 utilizes an originating number notification service to transmit a connection request that accompanies a telephone number to the sound emitting terminal 100. The sound emitting terminal 100 recognizes the telephone number, and emits calling sound where modulated waves on the basis of the telephone number are superimposed. The mobile communication terminals 200a and 200b identify the telephone number from the collected calling sound and makes the telephone number displayed.