A wireless communication system in which a first wireless access point which is configured to communicate with one or more wireless stations (STA11-STA12) within a first cell by orthogonal frequency-division multiple access operates in cooperation with a second wireless access point which is capable of performing carrier sensing with the first wireless access point and which is configured to communicate with one or more wireless stations (STA21-STA23) within a second cell by the orthogonal frequency-division multiple access, wherein the wireless communication system is characterized in that the first wireless access point is configured to assign a secondary channel that is not scheduled to use in the first cell to the second wireless access point, to permit the second wireless access point to use the secondary channel, and to perform wireless communication, each wireless station within the first cell comprises: a first data receiving means which is configured to receive different data destined to different wireless stations transmitted from the first wireless access point on different channels by the orthogonal frequency-division multiple access; and a first acknowledgement transmitting means which is configured to transmit a first acknowledgement for data destined to each wireless station within the first cell if the data destined to each wireless station within the first cell is correctly received by the first data receiving means, the second wireless access point comprises an access right acquiring means which is configured to acquire an access right, and each wireless station within the second cell comprises: a second data receiving means which is configured to receive data transmitted from the second wireless access point by the orthogonal frequency-division multiple access on the secondary channel for which the permission for use is acquired from the first wireless access point; and a second acknowledgement transmitting means which is configured to transmit a second acknowledgement after the access right is acquired if the data is correctly received by the second data receiving means. wherein the wireless communication system is characterized in that the first wireless access point is configured to assign a secondary channel that is not scheduled to use in the first cell to the second wireless access point, to permit the second wireless access point to use the secondary channel, and to perform wireless communication, each wireless station within the first cell comprises: a first data receiving means which is configured to receive different data destined to different wireless stations transmitted from the first wireless access point on different channels by the orthogonal frequency-division multiple access; and a first acknowledgement transmitting means which is configured to transmit a first acknowledgement for data destined to each wireless station within the first cell if the data destined to each wireless station within the first cell is correctly received by the first data receiving means, the second wireless access point comprises an access right acquiring means which is configured to acquire an access right, and each wireless station within the second cell comprises: a second data receiving means which is configured to receive data transmitted from the second wireless access point by the orthogonal frequency-division multiple access on the secondary channel for which the permission for use is acquired from the first wireless access point; and a second acknowledgement transmitting means which is configured to transmit a second acknowledgement after the access right is acquired if the data is correctly received by the second data receiving means. a first data receiving means which is configured to receive different data destined to different wireless stations transmitted from the first wireless access point on different channels by the orthogonal frequency-division multiple access; and a first acknowledgement transmitting means which is configured to transmit a first acknowledgement for data destined to each wireless station within the first cell if the data destined to each wireless station within the first cell is correctly received by the first data receiving means, the second wireless access point comprises an access right acquiring means which is configured to acquire an access right, and each wireless station within the second cell comprises: a second data receiving means which is configured to receive data transmitted from the second wireless access point by the orthogonal frequency-division multiple access on the secondary channel for which the permission for use is acquired from the first wireless access point; and a second acknowledgement transmitting means which is configured to transmit a second acknowledgement after the access right is acquired if the data is correctly received by the second data receiving means. a second data receiving means which is configured to receive data transmitted from the second wireless access point by the orthogonal frequency-division multiple access on the secondary channel for which the permission for use is acquired from the first wireless access point; and a second acknowledgement transmitting means which is configured to transmit a second acknowledgement after the access right is acquired if the data is correctly received by the second data receiving means.