An electronic device system includes a connection device configured to store a plurality of types of boot data and an electronic device, wherein the electronic device includes a connection unit to which the connection device is connected, a selection unit configured to select boot data to be obtained from the connection device connected to the connection unit, an obtaining unit configured to obtain the boot data selected by the selection unit from the connection device, a storage unit configured to store the boot data obtained by the obtaining unit; and a boot processing unit configured to perform processing in relation to booting of the electronic device by using the boot data stored in the storage unit.