An electronic device includes: a processor; a first storage storing firmware to be executed by the processor when the electronic device is activated, and key code information defining a function of an operation button; a second storage reading the key code information and temporarily storing the key code information in a rewritable manner; and a keyboard controller assigning a key code to the operation button based on the key code information stored in the second storage. The processor determines whether the key code information stored in the second storage has been rewritten during setup of the firmware, and generates key code change information for changing a key code assigned to the operation button when the processor determines that the key code information has been rewritten. The keyboard controller changes a key code assigned to the operation button based on the key code change information during the setup of the firmware.