LANE CHANGE ASSISTANCE SYSTEM AND LANE CHANGE METHOD USING THE SAME

A lane change assistance system includes: at least one sensor that detects sensing information including a first vehicle speed of a host vehicle, a second vehicle speed of a surrounding vehicle around the host vehicle, and a distance between the host vehicle and the surrounding vehicle; a lane change controller that identifies a lane change possible condition based on the sensing information, calculates an expected lane change time, and generates a lane change path for the expected lane change time; a steering device that controls lateral movement of the host vehicle based on the lane change path; and an acceleration and deceleration device that controls longitudinal movement of the host vehicle based on the lane change path.