An accurate determination of an operation is possible. Data photographed by a video camera is read by an image reading unit, and an image of an operator is extracted from the data by an image extracting unit. As a result of such preparation, a virtual operation screen and an operation region are created based upon the extracted image of the operator. In a case of an adult operator, an operation region can be created in consideration with a length (position of sight line) or a length of an arm, and in a case of a child, since a length is lower and a length of an arm is shorter, an operation region can be set to match it.