Data input device, image processing device, data input method and computer readable recording medium on which data input program is recorded

A computer readable medium storing a computer executable program for a method of displaying a plurality of key icons on a display, the method comprising:

• displaying a first screen on the display, 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;
• and
• displaying a second screen on the display, 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 but corresponds to the first input instruction, and the pull down menu corresponds to the set of second input instructions.