road image identification mechanism can be initiated and such mechanism can compare the captured road image with the image stored in the above mentioned image database not shown so as to determine whether the automobile is now running on the viaduct 42 or on the ground road 44 after that the road section the automobile is currently driving through has been determined the navigation route can be modified or re planned for the appropriate one should there be any discrepancy between the determination and the originally planned route the navigation apparatus using road image identification and navigating method disclosed by the present invention is not limited to the above mentioned two situations but also applicable to other road sections possibly confusing the driver including identification on much more complicated cross road wherein the preferred embodiment thereof records in the map database of the navigation system tags for the places where road identification process are specifically required and through the map database it is possible to be aware of the road section with a tag that the automobile is currently passing by then the road image process system may be initiated for road image capture and identification further with the assistance offered by the original navigation system more precise navigation effect can thus be acquired fig5 shows a functional block diagram of an embodiment of navigation apparatus using road image identification according to the present invention which performs essentially through the road image process system 53 shown in the figure road image capture and identification wherein the road image process system 53 is electrically connected to a camera device 51 the camera device 51 is installed on vehicles such as motorcycles or automobiles so as.