Method of and apparatus for correcting the position of movable body in navigation system

A method of correcting a present position of a movable body onto a position on a route (RD), where said movable body is supposed to exist, corresponding to the present position for use in a navigation system (S) for navigating said movable body, characterized in that said method comprises: a vector generation process of generating a moving vector (V) corresponding to a movement of said movable body with respect to a previously corrected position of said movable body as a start point of said moving vector; a display process of displaying a position of an end point of the generated moving vector as the present position of said movable body; and a correct process of correcting the position of the end point to a position on the route corresponding to the position of the end point after displaying the position of the end point by said display process.