1. A wireless communications system comprising: a base station; and a plurality of terminals, respective terminals communicating with the base station by means of interlacing for cyclically using a sub-frame to be subjected to time division multiplex, wherein the base station notifies the terminal of load information due to communication between the base station and the terminal, as determined at predetermined cycles in the predetermined cycles of a unit of the sub-frame, or shorter than that while the terminal determines load information by the sub-frame based on the load information notified by the base station, thereby selecting an interlace to be used for communication with the base station before communication is executed.