The present invention relates to a gaze-tracking device and method, a trace line of sight according to an embodiment of the present invention apparatus for both eyes of the user to watch the first image pickup unit, for acquiring an image by taking a direction subject to the user to give using for binocular image provided by the second image pickup unit for obtaining a binocular image, and the second imaging unit by detecting the pupil area of ​​both eyes, and maps the image of the target provided by the detected pupil region and the first image pickup section It characterized in that it comprises a video processor for extracting a region of interest of the target user to take.