An information input device includes a display device that displays an information input screen image and a touch-panel that is arranged on the display device and specifies a designated position on the information input screen image. On a function setting area, a plurality of function setting keys are displayed and, if a flick operation to the right made by the input device on the function setting area is detected, detailed setting items corresponding to each of the function setting keys are displayed on a detailed settings area. Consequently, contents of detailed settings can be displayed at one time in correspondence with each of the function setting keys. Therefore, it becomes possible for the user to easily confirm whether or not function setting is appropriate, and to smoothly select a function.