A multi-antenna array system includes active antennas each of which includes an antenna element and an amplifier that includes a matching circuit, a failure detector, and a circuit controller. The failure detector detects a failure in each of the active antennas, and in a case where a failure is detected in any of the active antennas, the circuit controller performs control to change a matching condition of the matching circuit included in each of the active antennas not having a failure such that total output power of the multi-antenna array system is maintained.