The server traffic information control unit (112) stores traffic information e.g. traffic volume and traffic jam. The traffic jam statistical processing portion (121) provides statistical data consisting of traffic jam frequent occurrence point and occurrence frequency based on stored information. The statistical data stored in an information database (113) is downloaded when requested. Independent claims are also included for the following: (a) a navigation system configured of a server providing information with a navigation apparatus by controlling a road map and traffic information; (b) a display method of a car navigation system which displays a position and proceeding direction of a car on a road map and displays a guide route as needed.
