1. An image processing method comprising: acquiring depth information of an image; separating a first region of interest for a region, in which a target exists, from the image; detecting a candidate region for the target from the first region of interest; determining if the detected candidate region corresponds to the target; detecting a target region by using the candidate region if the candidate region corresponds to the target; estimating a pose of the target by using the detected target region; and performing modeling with respect to the target.