When portable electronic equipment drops, CPU stops power supply to a prescribed unit. A prescribed unit is a unit that is not necessary for the continuous operation of the portable electronic equipment. When the portable electronic equipment collides with the floor or the ground, the battery terminal may be momentarily detached from the connector. In this case, instantaneous voltage drop or momentary power failure may occur. Power supply to a prescribed unit is stopped while power supply to CPU and RAM is continued. Therefore, power supply to CPU and RAM can be continued with electric charge stored in a capacitor inside the portable electronic equipment.