1. A people counter using a TOF (Time Of Flight) camera, comprising: an image receiving unit that receives image information about an image having one or more objects moving across an area under a TOF camera disposed on a ceiling; an object information collector that collects depth information and size information of the objects from the image information received through the image receiving unit; a corrector that corrects the depth information and the size information of the objects to actual depth information and actual size information in consideration of the height and the FOV (Field Of View) of the TOF camera; a filter that filters the actual depth information of the objects within a predetermined filtering range and creates a resultant image information for counting from the filtered depth information; and a counting unit that counts objects having a predetermined pattern from the resultant image information obtained by the filter.