A communication apparatus comprising: detection means arranged to detect a first operation by a user, for establishing a wireless communication channel with another communication apparatus; searching means (304, 305) arranged to search for another communication apparatus at which a second operation for establishing a communication channel has been made, the searching means comprising: transmitting means arranged to transmit, in response to detection of the first operation, a request signal for establishing a wireless communication channel in a predetermined frequency channel; and receiving means arranged for, a predetermined time period (S602-S609) from a time that the detection means detects the first operation, to wait for receiving a response signal in response to the request signal transmitted by the transmitting means and to wait for receiving a request signal from said another communication apparatus, and establishing means arranged to establish the communication channel with said another communication apparatus within the predetermined time period, the communication channel being established: (i) in response to reception of the response signal by the receiving means, and (ii) responsive to transmission of a response signal to said another communication apparatus following reception of the request signal from said another communication apparatus. detection means arranged to detect a first operation by a user, for establishing a wireless communication channel with another communication apparatus; searching means (304, 305) arranged to search for another communication apparatus at which a second operation for establishing a communication channel has been made, the searching means comprising: transmitting means arranged to transmit, in response to detection of the first operation, a request signal for establishing a wireless communication channel in a predetermined frequency channel; and receiving means arranged for, a predetermined time period (S602-S609) from a time that the detection means detects the first operation, to wait for receiving a response signal in response to the request signal transmitted by the transmitting means and to wait for receiving a request signal from said another communication apparatus, and transmitting means arranged to transmit, in response to detection of the first operation, a request signal for establishing a wireless communication channel in a predetermined frequency channel; and receiving means arranged for, a predetermined time period (S602-S609) from a time that the detection means detects the first operation, to wait for receiving a response signal in response to the request signal transmitted by the transmitting means and to wait for receiving a request signal from said another communication apparatus, and establishing means arranged to establish the communication channel with said another communication apparatus within the predetermined time period, the communication channel being established: (i) in response to reception of the response signal by the receiving means, and (ii) responsive to transmission of a response signal to said another communication apparatus following reception of the request signal from said another communication apparatus. (i) in response to reception of the response signal by the receiving means, and (ii) responsive to transmission of a response signal to said another communication apparatus following reception of the request signal from said another communication apparatus.