Lastly, in a fourth period 531₄, the responder transmits an SS-ACK packet using the most-desirable transmission sector of the initiator, which has been determined in the TXSS. The initiator receives the SS-ACK packet using the most-desirable reception sector used in receiving the SSW packet with the highest reception quality, which is one of the sixth to tenth SSW packets.

In this manner, the radio communication device 300 or the radio terminal 400 determines the most-desirable reception sector for the communication between the radio communication device 300 and the radio terminal 400 through the RSXX, and determines the determined most-desirable reception sector as the reception sector used in receiving a radio signal from the radio communication device 300 or the radio terminal 400.

In the state illustrated in FIG. 1, for example, the first radio communication device 300₁ performs the TXSS and the RXSS with each of the first to third radio terminals 400₁ to 400₃ in connecting to the first to third radio terminals 400₁ to 400₃. The second radio communication device 300₂ performs neither the TXSS nor the RXSS with any one of the radio terminals 400. The third radio communication device 300₃ performs the TXSS and the RXSS with each of the fourth and fifth radio terminals 400₄ and 400₅ in connecting to the fourth and fifth radio terminals 400₄ and 400₅.