1. A depth image-based representation (DIBR) method of modeling a 3-dimensional (3D) object, by which the 3D object is expressed by depth information, color information, and camera parameters or geometry information, color information, and camera parameters, wherein the camera parameters comprise position, orientation, ranges of camera view or angle (fieldOfView), front and back of a camera volume (nearPlane and farPlane) and projection information(orthographic) on whether an object is projected on a camera orthographically or perspectively, the method comprising: while modeling and/or rendering of the 3D object is performed, changing values of the camera parameters in real time.