A battery pack includes a setting information storage device for storing setting information for setting the functions of an electronic device; a setting information control device for controlling, in accordance with a control signal for the electronic device, processes for writing and reading the setting information to and from the setting information storage device; and a communication device for transmitting and receiving the setting information, which is controlled by the setting information control device via the communication terminal. The electronic device includes a setting information operation device for controlling operations for writing and reading the setting information to and from the storage device of the battery pack; and a communication device for transmitting and receiving, via a communication terminal, the setting information, which is operated by the setting information operation device.