A wireless communication system comprising a master station and multiple slave stations, wherein each of the slave stations includes a different-slave-station signal-acquiring unit that is arranged to acquire, during a predetermined communication time period, a signal transmitted to the master station by a different slave station that is a different one of the slave stations, a propagation information acquiring unit that is arranged to calculate, from the signal acquired by the different-slave-station signal-acquiring unit, propagation information on propagation between the different slave station and a subject slave station, and a propagation information sending unit that is arranged to transmit the calculated propagation information to the master station, and the master station includes a propagation information receiving unit that is arranged to receive propagation information transmitted by each of the slave stations, and a propagation information aggregating unit that is arranged to aggregate the received propagation information, characterized in that the propagation information sending unit is arranged to extract a different slave station in accordance with a predetermined rule that avoids predetermined duplication of propagation information and to transmit only the calculated propagation information to the master station based on a signal transmitted by the extracted different slave station. each of the slave stations includes a different-slave-station signal-acquiring unit that is arranged to acquire, during a predetermined communication time period, a signal transmitted to the master station by a different slave station that is a different one of the slave stations, a propagation information acquiring unit that is arranged to calculate, from the signal acquired by the different-slave-station signal-acquiring unit, propagation information on propagation between the different slave station and a subject slave station, and a propagation information sending unit that is arranged to transmit the calculated propagation information to the master station, and a different-slave-station signal-acquiring unit that is arranged to acquire, during a predetermined communication time period, a signal transmitted to the master station by a different slave station that is a different one of the slave stations, a propagation information acquiring unit that is arranged to calculate, from the signal acquired by the different-slave-station signal-acquiring unit, propagation information on propagation between the different slave station and a subject slave station, and a propagation information sending unit that is arranged to transmit the calculated propagation information to the master station, and the master station includes a propagation information receiving unit that is arranged to receive propagation information transmitted by each of the slave stations, and a propagation information aggregating unit that is arranged to aggregate the received propagation information, characterized in that a propagation information receiving unit that is arranged to receive propagation information transmitted by each of the slave stations, and a propagation information aggregating unit that is arranged to aggregate the received propagation information, characterized in that the propagation information sending unit is arranged to extract a different slave station in accordance with a predetermined rule that avoids predetermined duplication of propagation information and to transmit only the calculated propagation information to the master station based on a signal transmitted by the extracted different slave station.