A wireless communication apparatus comprising: a receiving unit configured to receive a response request signal; a transmitting unit configured to transmit a response signal in response to the response request signal; a measuring unit configured to continuously measure received power of the response request signal received by the receiving unit; and a communication control unit configured to cause the transmitting unit to transmit the response signal to a first of a plurality of wireless communication apparatuses that has transmitted the response request signal if the received power of the response request signal is higher than a threshold value, wherein the threshold value is set to a value that is greater than the maximum received power of radio waves emitted from a distance from the wireless communication apparatus greater than a predetermined value, wherein in the case where the receiving unit receives the response request signal from each of the plurality of wireless communication apparatuses, if the received power of the response request signal transmitted from the first wireless communication apparatus is higher than the threshold value and a difference between the received power of the response request signal transmitted from the first wireless communication apparatus and the received power of each of the response request signals transmitted from the other wireless communication apparatuses is larger than a predetermined value, the communication control unit is further configured to cause the transmitting unit to transmit the response signal to said first wireless communication apparatus. a receiving unit configured to receive a response request signal; a transmitting unit configured to transmit a response signal in response to the response request signal; a measuring unit configured to continuously measure received power of the response request signal received by the receiving unit; and a communication control unit configured to cause the transmitting unit to transmit the response signal to a first of a plurality of wireless communication apparatuses that has transmitted the response request signal if the received power of the response request signal is higher than a threshold value, wherein the threshold value is set to a value that is greater than the maximum received power of radio waves emitted from a distance from the wireless communication apparatus greater than a predetermined value, wherein in the case where the receiving unit receives the response request signal from each of the plurality of wireless communication apparatuses, if the received power of the response request signal transmitted from the first wireless communication apparatus is higher than the threshold value and a difference between the received power of the response request signal transmitted from the first wireless communication apparatus and the received power of each of the response request signals transmitted from the other wireless communication apparatuses is larger than a predetermined value, the communication control unit is further configured to cause the transmitting unit to transmit the response signal to said first wireless communication apparatus.