Disclosed is a physical processor. The processor is connected to an electronic device. The electronic device includes a rechargeable battery, a connector, and operation unit. The processor is configured to: determine whether an external device is a predetermined power supply apparatus; control communication with the external device so that the rechargeable battery is charged by a first current from the external device when the external device is the predetermined power supply apparatus; and control communication with the external device so that the rechargeable battery is charged by a second current from the external device when the external device is not the predetermined power supply apparatus. The second current is greater than the first current. The processor is further configured to control to playback content data stored in the electronic device based on a command from the operation unit by using power of the rechargeable battery.