To facilitate a motor driving circuit and reduce the cost in an air conditioner which is provided with a difference between the number of revolutions of both blowers, so as to prevent the abnormal sound caused by the mutual interference of two blowers.

This system is provided with a common solid state relay 106 common to both motors, between the first and second fan motors 101 and 102 provided in parallel and an AC power source 105. This is provided with the first capacitor 108 having the first capacity, between the common solid state relay 106 and the first fan motor 101. This is provided with the second capacitor 109 having the second capacity different from the first capacity, between the common solid state relay 106 and the second fan motor 102. A control circuit 110 is equipped with a revolution detecting circuit 112 which detects only the number of revolutions of the first fan motor 101, a CPU 111 which controls the common solid state relay 106 based on that number of revolutions, and a drive circuit 113.