An electronic device includes a detection unit that detects voltages of main and sub-power sources and a control unit that controls a display of the voltage of the main power source and a display of the voltage of the sub-power source on a display unit such that the displayed voltage of the main power source is updated to a newly-detected voltage even if a change between the new and displayed voltages is smaller than a predetermined threshold, and that the displayed voltage of the sub-power source is not updated to a newly-detected voltage if a change between the new and displayed voltages is smaller than the predetermined threshold, but is updated to the newly-detected voltage if the change between the new and displayed voltages is equal to or greater than the predetermined threshold.