A base station in a wireless communication system in which the base station and one or more terminals share the same frequency channel, the base station comprising: n antennas, where n is an integer of two or more; n power change units configured to change transmission powers or reception powers of signals transmitted or received in the n antennas, respectively; a power control unit configured to perform control of power changing by the n power change units; a power change management unit configured to manage a common power change amount that is common to the antennas, which corresponds to a prescribed reception power, and an individual power change amount that corresponds to a difference between a reception power of each antenna and the prescribed reception power, according to the reception powers of the signals received from each terminal to the n antennas (1 1), respectively; a common power notification unit configured to notify the power control unit of the common power change amount in accordance with a target terminal being a destination or source of a signal before the signals are transmitted or received in the n antennas, respectively; and an individual power notification unit configured to notify the power control unit in advance of the individual power change amount in accordance with the each terminal at a prescribed timing, wherein the power control unit is configured to store the individual power change amount, which is notified in advance by the individual power notification unit, in a storage unit, and to perform control of power changing by the n power change units, using an amount of power change that results from adding up the common power change amount in accordance with the target terminal, which is notified from the common power notification unit, and the individual power change amount in accordance with the target terminal, which is read from the storage unit. n antennas, where n is an integer of two or more; n power change units configured to change transmission powers or reception powers of signals transmitted or received in the n antennas, respectively; a power control unit configured to perform control of power changing by the n power change units; a power change management unit configured to manage a common power change amount that is common to the antennas, which corresponds to a prescribed reception power, and an individual power change amount that corresponds to a difference between a reception power of each antenna and the prescribed reception power, according to the reception powers of the signals received from each terminal to the n antennas (1 1), respectively; a common power notification unit configured to notify the power control unit of the common power change amount in accordance with a target terminal being a destination or source of a signal before the signals are transmitted or received in the n antennas, respectively; and an individual power notification unit configured to notify the power control unit in advance of the individual power change amount in accordance with the each terminal at a prescribed timing, wherein the power control unit is configured to store the individual power change amount, which is notified in advance by the individual power notification unit, in a storage unit, and to perform control of power changing by the n power change units, using an amount of power change that results from adding up the common power change amount in accordance with the target terminal, which is notified from the common power notification unit, and the individual power change amount in accordance with the target terminal, which is read from the storage unit.