A transmitting station includes: an error detecting code attachment block that attaches error detecting codes respectively to a plurality of data pieces; a transmitter block that transmits the plurality of data pieces with the error detecting codes attached thereto to a receiving station by using different radio frequencies, respectively; a receiver block that receives, from the receiving station, the results of error detections that the receiving station applies respectively to the plurality of data pieces on the basis of the error detecting codes attached respectively to the plurality of data pieces; and a transmission data managing block that controls retransmission of the data to the receiving station on the basis of the received results of the error detection.