A single imaging alone unit to realize the compactness of the equipment, along with the reduction of manufacturing cost by allowing you to calculate the three-dimensional coordinates of each marker is a tracking method which minimizes the constraints on the operation area a tracking system, and it is disclosed . The tracking system, and because the tracking method using the same are each a pair of the marker image in different locations of the imaging unit for each marker by a pair of light sources disposed in different locations it can be imaged, via a triangulation only a single image-forming unit wherein it can calculate the 3D coordinates of each of the markers determined by calculating the marker space position information and the direction information of attachment to the target product, it is possible to achieve a compact and lightweight with a reduction of the manufacturing cost of the tracking system compared to the conventional tracking system the constraints on the operation area there is an effect relatively are less.