Road route management method of navigation system and navigation system

The invention provides a road route management method of a navigation system. The method comprises steps of: S1. acquiring roads and road information according to user requirements, wherein the road information comprises road names and routes; S2. displaying the acquired roads that need to be managed in layers, wherein one layer displays the roads and the routes in a form of a background graph, and the other layer displays the road names and the routes in a form of a text interface; S3. managing the acquired road routes: receiving input operations of users, modifying the road routes into reality routes in the text interface, and redisplaying the modified routes as the way in the step S2.; and S4. modifying cartographic databases of the navigation system: acquiring the modified road information, comparing the modified road routes with the original routes, and changing the original routes into routes displayed at present in the cartographic databases if the modified road routes and the original routes are different.