To make terminals communicable with each other in random beam forming.

In a method for a base station device 2, which performs communication using a plurality of frequencies, to allocate a plurality of transmission streams to wireless terminal apparatus 31, 32, 33 in accordance with a random beam forming system, a random beam forming matrix is constituted as a function of frequency. On the basis of the random beam forming matrix that is a function matrix of frequency, the wireless terminal apparatus 31, 32, 33 selects such a transmission sub stream candidate and frequency as improving an SINR and notifies the base station device 2 about the selected transmission stream candidate and frequency. On the basis of the transmission sub stream candidate and frequency, the base station device 2 determines the transmission sub streams and frequencies to be allocated to the wireless terminal apparatus 31, 32, 33.

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