The invention provides a driving assist system using vehicle using navigation information. The driving assis system includes: a navigation device providing navigation information; a controller determining whether the vehicle deviates from a navigation route based on a driving lane of the vehicle at or near a junction of a highway, and when the controller determines that the vehicle deviates from the navigation route, performing at least one driving assist operation based on information of a road on which the vehicle is currently driving; and a display device displaying the information of the road on which the vehicle is currently driving.