To select terminal devices without reducing system capacity and without being unfair when selecting a plurality of terminal devices for performing spatial division multiplexing.

This base station device 10 includes a first antenna 12a, a second antenna 12b and a fourth antenna 12d called collectively an antenna 12, a first radio part 20a, a second radio part 20b and a fourth radio part 20d called collectively a radio part 20, a first processing part 22a, a second processing part 22b and a fourth processing part 22d called collectively a processing part 22, a first modulating and demodulating part 24a, a second modulating and demodulating part 24b and a fourth modulating and demodulating part 24d called collectively a modulating and demodulating part 24 and an interface part 26.

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