A wireless communications apparatus (100) includes: antennas (111, 112, and 113); a threshold identifying unit (141) which measures a first radio propagation environment parameter by using a specific directional pattern, and identifies a threshold, from among thresholds, which corresponds to the measured first radio propagation environment parameter; a directional pattern selecting unit (142) which performs test communications by sequentially switching directional patterns, and selects a directional pattern having an actual throughput, calculated from a measurement value of a second radio propagation environment parameter, greater than the threshold; and a threshold adjusting unit (143) which changes the threshold identified by the threshold identifying unit (141), according to the number of test communications that is the number of the directional patterns used for the test communications performed by the directional pattern selecting unit (142).