Patent ID: 7685532

Claim:
A method for displaying a plurality of key icons on a display of an operating panel unit of a device controlled by user input, the method comprising: displaying a first screen on the display of the operating panel unit of the device, the first screen comprising at least one first key icon and a plurality of second key icons, wherein the first key icon corresponds to a first input instruction while each of the second key icons respectively corresponds to a respective one of a set of second input instructions; receiving, on the operating panel unit of the device, a user input containing an instruction to manipulate a size of the first key icon; and controlling the display of the operating panel unit of the device to, upon receipt of the user input, display a second screen on the display of the operating panel unit of the device, the second screen comprising at least one third key icon and a pull down menu, wherein the third key icon is bigger than the first key icon and corresponds to the first input instruction, and the pull down menu corresponds to the set of second input instructions.