A method for associating a stereo image, by acquiring images of an object from a first point and a second point and by associating the image at the first point and the second point, comprising a step of moving from the first point to the second point while taking an image of the object, a step of setting two or more pass points on the image of the first point, a step of comparing a preceding image and a subsequent image over time, a step of retrieving and identifying the pass points of the preceding image in the subsequent image, a step of retrieving and identifying the pass points sequentially with respect to every frame image data from the image of the first point to the image of the second point, a step of identifying the pass points of the image of the second point, and a step of associating the image at the first point with the image at the second point via the pass points.