PURPOSE: To input the various kind of information by providing an anxiliary tool for input to be used while being placed on a coordinate input device with at least one height changing point.

CONSTITUTION: As auxiliary tool 12 for input to be used while being placed on the coordinate input device provided with a function for detecting the pen down signal or pen pressure of a position indicator is composed of the flat panel of non-metal material such as plastic and provided with a guide groove with prescribed depth at one part. The specified information is inputted by combining a shape observed from the upper face of this guide groove with the height changing point. The height changing point shown in the figure B is provided at a place shown by marks X in guide grooves of a circle 41, rectangle 42, straight line 43 and signal Z44 in the figure A. When an operator inputs a pulse signal by passing through the height changing point once in the middle of inputting a coordinate with the circle 41, for example, a computer comprehends the operator reports the start of a circular arc plotting mode, and the circle having two points as the radius is displayed by inputting the next two points.