Image Number 6 for United States Patent #6446000.
A guidance information setting unit specifies, during a route guidance operation, a first intersection that the vehicle is about to pass and a second intersection that the vehicle is to pass thereafter, where the vehicle makes a right-turn or a left-turn. Next, the guidance information setting unit sets a recommended travel lane by which the vehicle minimizes the lane change frequency until it reaches the second intersection, and outputs information concerning the recommended travel lane to an intersection guidance unit as the guidance information. The intersection guidance unit produces, as the intersection guidance information concerning the first intersection, drawing data of the intersection guidance information that displays with emphasis the recommended travel lane set by the guidance information setting unit, and displays the data on the screen of a display unit through an image synthesizing unit. As a consequence, the navigation system of the invention ensures an appropriate travel state for the vehicle.