A layout method for an operation key group in a portable terminal apparatus 1 that displays an operation key group on a display unit 4 to perform input operation via a touch panel 5, the layout method including: determining, on the basis of user operation for drawing a line figure on the touch panel 5, a display position and a range of an operation key group displayed on the display unit 4; and displaying the operation key group on the display unit 4 on the basis of the determined display position and the range.