1. A device for simulating 3D printing comprising: a 3D model texture data input unit configured to input 3D model texture data of an object to be outputted through a 3D printer; a realistic preview data generating unit configured to generate realistic preview data by converting the 3D model texture data; a rendering image generating unit configured to generate a first rendering image based on the 3D model texture data and a second rendering image based on the realistic preview data; and an output control unit configured to control the 3D printer to output the second rendering image through the 3D printer.