An input apparatus for, in response to a user's sliding operation on an operation surface, inputting a coordinate point in the operation surface to move a pointing image to a target button image is disclosed. The apparatus acquires the coordinate point in the operation surface and sets, as a characteristic line, a tendency of trace of the coordinate point in the user's sliding operation directed to a lateral direction or a longitudinal direction of the operation surface. The apparatus corrects the coordinate point with reference to the set characteristic line so that the trace of the coordinate point is corrected to be a horizontal line or a vertical line. The apparatus outputs the corrected coordinate point for moving the pointing image.