Provided is an electronic device wherein a clocking part measures an adjusting operation time on an initial adjustment screen, a screen display item determination part makes a comparison between a first target value and a measuring result of the clocking part to determine a displaying number of adjusting items, and by doing so, a system control part will cause a panel part as a display part to display screens (detailed adjustment screens) of different displaying numbers of the adjusting items based on the screen display data corresponding to the displaying number of the adjusting items that has been determined by the screen display item determination part.