Abstract: Three-dimensional position information inputted by an input unit is detected by a detecting unit and is converted into coordinate information in a specific plane and height information in an axial direction perpendicularly intersecting to the plane by an operating section of a processing unit. In the case of a plurality of input units, the information is discriminated per input unit by a discriminating section of the processing unit. The information is stored in a memory section and is taken out from the memory section suitably and is outputted as display information by an I/O section of the processing unit so that display is changed according to a size of the height information. The outputted information is indicated by, for example, a designating graphic on an output unit. At this time, an operator can recognize a distance between the input unit and the detecting unit and discriminate the information according to shades of a color of the designating graphic.