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.