A mobile navigation system includes display map information generator to generate display map information based on the present position information of a mobile vehicle, reads, from a map information storing device, the map information of the near region at the external side of the region indicated with the display map information for each movement of the mobile vehicle of only the predetermined distance, and generates and stores the map information in the far region extending along the moving route of the mobile vehicle. The mobile navigation system can store the desired map information without any limitation on the capacity of memory and quickly display the necessary map information.