An example communication system includes: a search communication apparatus which searches for another communication apparatus; and a search subject communication apparatus which is searched for by the search communication apparatus. The search communication apparatus includes a search request transmitter which transmits a search request signal. The search subject communication apparatus includes: a search request receiver which receives the search request signal transmitted from the search communication apparatus; and a search response transmitter which transmits a search response signal which is a response to the search request signal received by the search request receiver, to the search communication apparatus. The search communication apparatus further includes a search response receiver which receives the search response signal transmitted from the search subject communication apparatus. The search request transmitter transmits information indicating a transmission enabled period in which the search response transmitter can transmit the search response signal.