1. A driver assistance apparatus comprising: a camera configured to acquire an image outside of a driver's vehicle, the image being a vehicle front view image, a vehicle rear view image or a vehicle side view image; and a processor configured to detect an object in the image, determine whether a collision between the driver's vehicle and the object is expected, and provide a height control signal for a suspension of the driver's vehicle to adjust a height of an expected impacted portion of the driver's vehicle.