1. A calibration device comprising: a display device that can generate a stereoscopic image; a depth level sensor that measures a distance to an object; and a calibration service unit that adjusts the stereoscopic image generated by the display device and a depth level of the object detected by the depth level sensor wherein the calibration service unit determines a common region that is shared by a stereoscopic region that can be generated as the stereoscopic image and a depth level detection region of the depth level sensor, according to a length from a shoulder joint at a side of the object to the object.