In a transmission antenna directivity control apparatus, a reception multi-beam generation section (103) executes weights and combines reception signals from reception array antenna elements (101) using a preset weight coefficient to generate reception multi-beams. A transmission weight coefficient generation section (106) generates, in accordance with detected powers of the reception multi-beams, a transmission weight coefficient for transmission data in correspondence with each of transmission multi-beams corresponding to transmission array antenna elements (109). A transmission multi-beam generation section (107) multiplies the transmission data by the transmission weight coefficient to generate the transmission multi-beams and supplies them to the corresponding transmission array antenna elements. In the transmission weight coefficient generation section, a power ratio calculation section calculates a power ratio of a maximum power of the detected powers of the reception multi-beams to the power of a beam adjacent to the maximum power beam, which exhibits a larger power beam, and a transmission weight coefficient calculation section (106) calculates the transmission weight coefficient on the basis of the power ratio. A transmission antenna directivity control method is also disclosed. IMAGE
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