A navigation device includes: a memory storing map data of a map used for route searching; a traffic information receiving unit receiving traffic information from an external server; a matching unit matching a traffic event included in the received traffic information to the map used for route searching based on the traffic information; and a correction unit performing correction by removing a portion matched to an expressway of the map from a section to which the traffic event is matched on the map by the matching unit. The traffic event includes a closed event on a slip road, and the traffic event is matched to the expressway.