To easily and effectively operate and input an operation instruction for an object to be operated existing in a three-dimensional space from an operation screen to be constituted on a two-dimensional plane.

A transformation matrix 2A for three-dimensional coordinate transformation corresponding to an operation and input of a manipulated variable 1A is calculated based on the manipulated variable 1A from an operation and input means 1 by a transformation matrix generating means 2A, a planar cursor shape 3A from a planar cursor generating means 3 is transformed into a planar cursor graphic 4A by performing the three-dimensional coordinate transformation by a planar cursor projection means 4A. In addition, an environmental video 5A from a two-dimensional image input means 5 is transformed into an internal graphic 6A by performing the three-dimensional coordinate transformation based on the transformation matrix 2A by a two-dimensional image transformation means 6 the internal graphic 6A are synthesized by a screen synthesizing means 7 and displayed on the operation screen 8A of an operation screen display means 8.