1. A method of extracting an object, the method comprising: performing, by a resizing device, at least one resizing on an extraction model pattern for the object to be extracted to obtain at least two or more extraction model patterns having different sizes; scanning, by an object extraction device, a current image frame, captured by a camera, using each of the at least two or more extraction model patterns, and extracting the object that is matched with any one of the at least two or more extraction model patterns; displaying, by a display, information about a position of the extracted object; selecting an object model pattern of the object to be extracted, from among various object model patterns stored in a database, the various object model patterns respectively corresponding to different feature vectors according to types of the object, the different feature vectors being extracted by using a histogram of gradient (HOG) algorithm, and setting the selected object model pattern as the extraction model pattern.