1. A driving support system comprising: an object detecting unit for detecting a position of an object existing around an own vehicle; a determining unit for determining whether or not a probability that the own vehicle will collide with one or more objects is equal to or more than a certain level based on the position of the object; a starting unit for starting a driving support for avoiding collision when an affirmative determination is made by the determining unit; an area detecting unit for detecting a target area on which the own vehicle is expected to travel; and an adjusting unit for adjusting a sensitivity of a determination of a collision probability based on a positional relationship between the object and the target area wherein the object detecting unit further detects a moving direction of the object; the adjusting unit adjusts the sensitivity by further considering the moving direction of the object; the adjusting unit determines whether an object existing outside the target area is moving towards the target area or not based on the positional relationship between the object and the target area and the moving direction of the object; the sensitivity is enhanced when an affirmative determination is obtained.