A wireless communication device, comprising: a transmitter configured to transmit a first frame including first information required for generation of a trigger frame for uplink multi-user transmission, wherein the transmitter is configured to access a wireless medium under CSMA/CA, Carrier Sense Multiple Access with Carrier Avoidance during a carrier sense time defined in accordance with an access category associated with the first frame and a back-off time to transmit the first frame, and the access category associated with the first frame is one of a plurality of access categories, a receiver configured to receive an acknowledgement frame for the first frame in a first interframe space after the first frame is transmitted and receive a second frame designating at least one terminal which is a target of the uplink multi-user transmission, wherein the second frame is the trigger frame wherein the transmitter is configured to transmit a third frame in the uplink multi-user transmission when the wireless communication device is designated in the second frame, and the first information includes: information indicating amounts of data in a plurality of buffers corresponding to the plurality of access categories; and information indicating an access category having a highest transmission priority among the plurality of access categories for the uplink multi-user transmission wherein the access category having the highest transmission priority is an access category most desirable to transmit by the wireless communication device and is any one selected from the access categories by the wireless communication device. a transmitter configured to transmit a first frame including first information required for generation of a trigger frame for uplink multi-user transmission, wherein the transmitter is configured to access a wireless medium under CSMA/CA, Carrier Sense Multiple Access with Carrier Avoidance during a carrier sense time defined in accordance with an access category associated with the first frame and a back-off time to transmit the first frame, and the access category associated with the first frame is one of a plurality of access categories, a receiver configured to receive an acknowledgement frame for the first frame in a first interframe space after the first frame is transmitted and receive a second frame designating at least one terminal which is a target of the uplink multi-user transmission, wherein the second frame is the trigger frame wherein the transmitter is configured to transmit a third frame in the uplink multi-user transmission when the wireless communication device is designated in the second frame, and the first information includes: information indicating amounts of data in a plurality of buffers corresponding to the plurality of access categories; and information indicating an access category having a highest transmission priority among the plurality of access categories for the uplink multi-user transmission wherein the access category having the highest transmission priority is an access category most desirable to transmit by the wireless communication device and is any one selected from the access categories by the wireless communication device. information indicating amounts of data in a plurality of buffers corresponding to the plurality of access categories; and information indicating an access category having a highest transmission priority among the plurality of access categories for the uplink multi-user transmission wherein the access category having the highest transmission priority is an access category most desirable to transmit by the wireless communication device and is any one selected from the access categories by the wireless communication device. <EOS>