Abstract: Includes a map information storage unit (4) having map information stored therein; an input unit (6) for inputting a destination; a route information control unit (7) for acquiring supplementary route information corresponding to the destination from outside; a supplementary route information storage unit (10) for storing supplementary route information; a joint point setting unit (11) for setting a coordinate set on a road close to a start point coordinate set of the route included in the supplementary route information as a termination point of a route to be retrieved based on the map information stored in the map information storage unit (4); a route search unit (8) for searching for a route to the termination point set by the joint point setting unit (11); and a route guidance control unit (12) for controlling route guidance based on the route retrieved by the route search unit (8) and route guidance based on the supplementary route information acquired by the route information acquisition unit (7) to be