Navigation method and system

A navigation system includes a navigation center and at least one moving body. The navigation center of the navigation system comprises memory means for storing navigation information; updating means for constantly updating the navigation information stored in the memory means; route searching means for setting a route from a current position of the moving body to a destination on the basis of the newest navigation information updated by the updating means; dividing means for dividing the searched route into at least two portions; extracting means for extracting navigation data concerning at least a head portion of the divided route from the memory means; transmitting means for transmitting to the moving body the extracted navigation data; and control means. After transmitting the navigation data for the head portion to the moving body and before transmitting navigation data for a remaining route, the control means controls each of the route searching means, the dividing means, the extracting means and the transmitting means so that each means performs the respective processes. This arrangement enables a user of the moving body to be provided with route guidance which is conducted using the navigation data formed based on the newest navigation information that reflects various road conditions.