1. A method of generating a 3-dimensional (3D) model comprising: detecting edges corresponding to points where changes in image information are equal to or greater than a threshold in an object of a 2D image; by using geometric information of an extended edge line determined to be positioned closest to a center of the object, from among extended lines of the detected edges converging at at least one vanishing point that is a point at which the extended edge lines intersect each other, calculating a plane equation of a surface of the object corresponding to the at least one vanishing point; and by using 2D image data and the calculated surface plane equation, generating a 3D model of the object.