1. A navigation system for a vehicle for generating a plurality of routes from a present position of the vehicle to a destination, the navigation system comprising: present position acquiring means for acquiring the present position; information storage means for storing map data of a map and storing position detection data including a relation between a type of each of various facilities and a facility position of the each of the various facilities on the map, display means for displaying the map based on the map data; factor chart display controlling means for associating one or more factors with each of the plurality of routes and forming a factor chart of the route and the associated one or more factors, the factor chart display controlling means for causing the display means to display the factor chart of the associated one or more factors of the each of the plurality of routes; facility search means for searching for at least one facility located along the each of the plurality of routes based on the position detection data; and facility display controlling means for causing the display means to display the at least one facility for the each of the plurality of routes together with the factor chart of the associated one or more factor.