On a vehicle, such as a car, etc., a camera, a navigation, communication function are mounted, and an image picked up from the car is uploaded to a server. Road information uploaded from each the car is collected up to the server. Each the car downloads the information existing in the server at the time when it is running. With provision of such the system, the car itself can confirm the condition of a spot through which it will pass from now, by using the information which is picked up by other car passing through that spot just before.