ELECTRONIC DEVICE, CONNECTION DEVICE, SYSTEM, POWER SUPPLY METHOD, AND POWER SUPPLY PROGRAM

A digital camera includes a first battery, a power supply circuit, and a power supply management unit, and an accessory having second batteries and a communication unit is connectable to the digital camera. The power supply management unit performs control to supply power to the communication unit from the first battery and to supply power to the power supply circuit from any one of the second batteries, in a state in which the accessory is connected, and performs control to supply power to the power supply circuit from the first battery in a state in which the accessory is not connected.