1. A camera parameter calibration apparatus, comprising: a 3-dimensional (3D) space manager generating a 3D object in a 3D space using a plurality of parameters related to a visual point of the 3D space and a 3D object database, the plurality of parameters including those of height, tilt angle, field of view, lens characteristics, focal length and resolution of a camera, the 3D object being replaceable, addable or removable according to a control of a user via a user interface, and being displayable on a base surface of the 3D space using a 2D grid; an image combiner combining the 3D object generated by the 3D space manager with a real image provided from an external image source, and displaying the combined 3D object and the real image, the plurality of parameters being manually alterable by the user of the apparatus via the user interface to match the generated 3D object to an object in the real image; and a setting manager storing any altered parameter and associating the altered parameter with the external image source.