To allow a robot body to quickly resume operation, using simple control, when a main power supply is restored after a failure. A calculation unit divides a series of operations of the robot body into a plurality of operation blocks in advance and causes the robot body to perform operations sequentially from one operation block to another using power supplied from the main power supply (S21 to S25). The calculation unit causes the robot body to continue operation using the power supplied from an auxiliary power supply, even if the main power supply fails, until the operation block being processed at the time of the failure of the main power supply out of the plurality of operation blocks is finished (S27). The calculation unit causes the robot body to stop operation, when the operation block being processed at the time of the failure of the main power supply is finished, until the main power supply is restored from the failure (S28). When the main power supply is restored from the failure, the calculation unit causes the robot body to resume operation beginning with an operation block next to the operation block caused by the calculation unit to be performed by the robot body in the process of step S27 (S30, S31, and S22).