A plurality of pieces of data is properly transmitted with use of a plurality of beams. Data generated in an application is divided into a plurality of pieces of data, different priories are assigned to the plurality of pieces of data, and the plurality of pieces of data is transmitted with a plurality of beams. A beam quality acquiring section acquires quality of each of the plurality of beams. A beam evaluating section performs evaluation of the plurality of beams on the basis of quality of each of the beams. A beam assigning section determines a correspondence between the plurality of beams and the plurality of pieces of data on the basis of evaluation of the beams and the priorities of data. A controller controls a transmitter to transmit the plurality of pieces of data through the corresponding plurality of beams.