APPARATUS FOR ASSISTING DRIVING, VEHICLE HAVING THE SAME, AND METHOD OF CONTROLLING THE SAME

Provided is an apparatus for assisting driving of a host vehicle including: an obstacle detector configured to detect an obstacle using a radar sensor; and a controller configured to determine a free-space in which a host vehicle is movable based on a position of the detected obstacle, and determine an obstacle located at a boundary of the free-space as an object having a risk of collision.