device 32 and displays it on the display 24 in this way the first location free display 3 can share the detailed information concerning the poi data or route data stored in the removable medium via the external storage device 32 with the navigation device 2 and the second location free display 4 in the vehicle mounted navigation system 31 of the above configuration according to the second embodiment the external storage device 32 connected to the first location free display 3 has the number of storage id appended and the storage device id is specified by the poi data or route data and employed as the index data to create the user data table in the vehicle mounted navigation system 31 each of the first location free display 3 the navigation device 2 and the second location free display 4 creates and employs the user data table whereby the navigation device 2 and the second location free display 4 can easily acquire the detailed information from the external storage device 32 via the first location free display 3 even if the storage location for the detailed information of the poi data or route data corresponding to the selected item based on the user data table by the navigation device 2 and the second location free display 4 is in the external storage device 32 connected to the first location free display 3 also in the vehicle mounted navigation system 31 the poi data or routed at a stored in the removable medium is read via the external storage devices 32 and 33 connected to the first location free display 3 and the second location free.