A system includes an image capturing device, a subject reference marker disposed adjacent to a subject, a tool reference marker disposed on a treatment tool, a display device mounted on an operator, an operator reference marker disposed on the display device, and a processor. The image capturing device includes two image capturing modules that simultaneously and respectively capture two images of the operator, the subject, and the treatment tool. The processor receives the images, analyzes the images to obtain spatial locations of the reference markers, and transmits coordinate information and auxiliary information.
