A navigation system including: a map image storage device which stores a map image having a polygon image being correlated to a facility name; a facility information storage device which stores the facility name and a facility location and also correlates the facility name to the facility location; a display device which displays the map image and a pointing image which is movable; a positioning device which specifies a position on the map image with the pointing image; and a destination setting device which sets a destination based on the position specified by the positioning device, wherein in a case where an arbitrary position on the polygon image is specified by the positioning device, the destination setting device retrieves the facility name correlated to the polygon image, retrieves the facility location correlated to the retrieved facility name, and sets the destination to the retrieved facility location.