A MIMO-OFDM communication method for a base station that uses a plurality of OFDM transmitters (11 0 - 11 3) to transmit data and pilot signals to a mobile stat i on from a plurality of antennas (12 0 - 12 3) by multiple input multiple output (MIMO) communication, comprising: providing for each cell (CELL A, CELL B, CELL C) a base station (BS A, BS B, BS C) configured to transmit data and pilot signals (P1, P2, P3, P4) to a mobile station using a plurality of antennas (12 0 - 12 3) respectively by MIMO communication which is multiple data stream transmission, and by single input multiple output (SIMO) communication, which is single data stream transmission for transmitting data and a pilot signal using a single antenna (12 0); transmitting data and pilot signals (P1, P2, P3, P4) from each base station (BS A, BS B, BS C) to the mobile station by MIMO communication or transmitting data and a pilot signal from each base station (BS A, BS B, BS C) to the mobile station by SIMO communication in accordance with changes in the communication environment between the base station (BS A, BS B, BS C) and the mobile station indicated by a signal to interference ratio: and arranging the pilot signals (P1, P2, P3, P4) such that a pilot signal selected from among the plurality of pilot signals (P1, P2, P3, P4) as the pilot signal transmitted by SIMO communication in a specified cell (CELL A), and a pilot signal selected from among the plurality of the pilot signals (P1, P2, P3, P4) as the pilot signal transmitted by SIMO communication in adjacent cells (CELL B, CELL C) do not overlap each other in the frequency direction and/or time axis direction, and arranging the plural ity of pilot signals (P1, P2, P3, P4) transmitted from the plural ity of the antennas (12 0 - 12 3) so that the plurality of pilot signals (P1, P2, P3, P4) do not overlap each other in the frequency direction in each cell (CELL A, CELL B, CELL C). providing for each cell (CELL A, CELL B, CELL C) a base station (BS A, BS B, BS C) configured to transmit data and pilot signals (P1, P2, P3, P4) to a mobile station using a plurality of antennas (12 0 - 12 3) respectively by MIMO communication which is multiple data stream transmission, and by single input multiple output (SIMO) communication, which is single data stream transmission for transmitting data and a pilot signal using a single antenna (12 0); transmitting data and pilot signals (P1, P2, P3, P4) from each base station (BS A, BS B, BS C) to the mobile station by MIMO communication or transmitting data and a pilot signal from each base station (BS A, BS B, BS C) to the mobile station by SIMO communication in accordance with changes in the communication environment between the base station (BS A, BS B, BS C) and the mobile station indicated by a signal to interference ratio: and arranging the pilot signals (P1, P2, P3, P4) such that a pilot signal selected from among the plurality of pilot signals (P1, P2, P3, P4) as the pilot signal transmitted by SIMO communication in a specified cell (CELL A), and a pilot signal selected from among the plurality of the pilot signals (P1, P2, P3, P4) as the pilot signal transmitted by SIMO communication in adjacent cells (CELL B, CELL C) do not overlap each other in the frequency direction and/or time axis direction, and arranging the plural ity of pilot signals (P1, P2, P3, P4) transmitted from the plural ity of the antennas (12 0 - 12 3) so that the plurality of pilot signals (P1, P2, P3, P4) do not overlap each other in the frequency direction in each cell (CELL A, CELL B, CELL C).