Reduction of wasteful power consumption is envisaged. A power supply function-equipped electronic apparatus (10) is configured to be capable of supplying power to a battery device (20) incorporating abattery (21) by use of a cable (30) connecting the apparatus (10) with the device (20). A detection section (13) detects whether charging of the battery (21) incorporated in the battery device (20) is complete through the cable (30). When charging of the battery (21) is detected to be complete, a power control section (12) turns off power of the power supply function-equipped electronic apparatus(10). This invention can be applied illustratively to gaming machines and the like each composed of a gaming machine body and its controller.