1. An image processing apparatus, comprising: a light capturing camera device configured to generate light environment information by capturing a light environment of an object; an object capturing camera device configured to generate object information by capturing the object; a processor; and a modeler implemented by the processor and configured to generate a 3-dimensional (3D) model by combining the light environment information and the object information, wherein the light environment information comprises a direction of a first light source included in the light environment, a distance between the first light source and the image processing apparatus, and information of indirect lightings of a second light source, wherein the indirect lightings is reflected light emitted from the second light source, wherein the object information comprises a depth image of the object, a color image of the object, and a distance between the object and the image processing apparatus, wherein a field of view of the light capturing device does not overlap with most of a field of view of the object capturing device, wherein the field of view of the light capturing device is stationary with respect to the field of view of the object capturing device, wherein the modeler is configured to generate the 3D model by reflecting a part of the light environment information or by adding a virtual lighting, wherein the processor is configured to: render, in response to input of a virtual object being determined as absent, with respect to the 3D model, and composite, in response to the virtual object being input, by matching the object information with an existing 3D model prior to rendering, and wherein a real space is constructed into the 3D model by real photographing and the virtual object is input separately from the 3D model.