A wireless communication system in which one wireless LAN access point, AP, and a plurality of wireless LAN stations, STAs, are connected to each other, and in which a wireless frame is simultaneously transmitted from each of the plurality of STAs to the AP in a multiple access scheme, wherein: the AP includes: a station information collection unit configured to collect from the plurality of STAs station information which is used for selection of STAs performing simultaneous transmission and for control of the simultaneous transmission (S11), wherein the station information collection unit included in the AP is configured to collect propagation characteristic information of the STA as the station information; a simultaneous-transmission determination unit configured to select a combination of STAs performing the simultaneous transmission based on the station information (S12), to compare data transmission efficiency of the simultaneous transmission when performed by the combination of STAs with data transmission efficiency of a transmission when performed by a single STA based on the propagation characteristic information being collected (S12, S13), and to select the combination of STAs as the combination of STAs performing the simultaneous transmission when the data transmission efficiency of the simultaneous transmission is higher; a trigger transmission unit configured to transmit to each of the STAs performing the simultaneous transmission a trigger frame which instructs to perform the simultaneous transmission and which includes information necessary for the control of the simultaneous transmission (S15), each of STAs that is designated by the trigger frame is configured to simultaneously transmit the wireless frame to the AP. a station information collection unit configured to collect from the plurality of STAs station information which is used for selection of STAs performing simultaneous transmission and for control of the simultaneous transmission (S11), wherein the station information collection unit included in the AP is configured to collect propagation characteristic information of the STA as the station information; a simultaneous-transmission determination unit configured to select a combination of STAs performing the simultaneous transmission based on the station information (S12), to compare data transmission efficiency of the simultaneous transmission when performed by the combination of STAs with data transmission efficiency of a transmission when performed by a single STA based on the propagation characteristic information being collected (S12, S13), and to select the combination of STAs as the combination of STAs performing the simultaneous transmission when the data transmission efficiency of the simultaneous transmission is higher; a trigger transmission unit configured to transmit to each of the STAs performing the simultaneous transmission a trigger frame which instructs to perform the simultaneous transmission and which includes information necessary for the control of the simultaneous transmission (S15), each of STAs that is designated by the trigger frame is configured to simultaneously transmit the wireless frame to the AP. <EOS>