1. An object recognition system which recognizes an object in a Region Of Interest (ROI) of a source image, the object recognition system comprising: an image change unit receiving the source image, and changing the object into an edge image which is represented as an edge line; and an ROI detection unit dividing the edge image into a plurality of regions, comparing a total sum of edge component values of an edge line comprised in each of the regions and a predetermined threshold value by regions, and detecting a region, in which the total sum of edge component values is greater than the threshold value, as the ROI from among the plurality of regions.