1. A characterizing point checking region setting unit comprising: a sample frame extract unit which extracts a plurality of image frames, obtained for a certain period of time, from image data obtained by photographing an object; and a frame analyzing unit which detects a plurality of characterizing points in the extracted plurality of image frames, and sets a characterizing point checking region, which is used to check the detected characterizing points, in a currently input image frame, wherein the frame analyzing unit comprises: a characterizing point detector which receives the plurality of image frames from the sample frame extract unit, and detects the plurality of characterizing points in the plurality of image frames; a characterizing point classification unit which classifies the plurality of characterizing points into a plurality of clusters for each of the image frames; a center point detector which detects a centroid point of the characterizing points in the plurality of image frames; and a check region determination unit which sets the characterizing point checking region including a major cluster among the plurality of clusters based on the centroid point.