provided is a navigation system capable of outputting situation information of a specified area according to real - time traffic information including a traffic regulation . a navigation apparatus can make a user recognize the moment when a vehicle enters a specified area where a situation which affects the travel of the vehicle along a navigation route is generated and the situation ) indicating the situation by using an icon indicating an entry position and having a design decided according to the situation information ). the navigation apparatus also can advice the user to instruct the navigation apparatus to perform an appropriate countermeasure in accordance with the situation such as re - search of the navigation route or detour from the navigation route being outputted .