PURPOSE: To facilitate the input operation of coordinate displacement data in a certain direction by using input direction data calculated from displacement data of two-dimensional coordinates to convert this displacement data to coordinates.

CONSTITUTION: A displacement data means 1 outputs displacement data of two-dimensional coordinates. An input direction data calculating means 3 calculates direction data from this displacement data and outputs it to an input direction data storage means 4 and outputs values X and Y to a coordinate converting means 5. When an operator gives an input direction setting indication by an input direction setting indication means 2 at the time of coordinate input, the coordinate converting means 5 converts displacement data to displacement data in the set direction. Consequently, displacement data in a specific direction can be inputted by arbitrary two-dimensional input operation. As the result, the input operation of coordinate displacement data in a certain direction, namely, the coordinate input operation for input of plural coordinate displacements in the same direction is facilitated.