1. A system for capturing a pupil, the system comprising: an image obtainer configured to obtain front image data of a user; a illuminator configured to provide a lighting at the time of obtaining the image data; and a pupil extractor configured to receive the image data photographed in a light strength state having a predetermined reference value or more by the illuminator and apply a thresholding process to an eye region of interest (ROI) within the image data, the thresholding process extracting pixels having intensity having a value which is less than the predetermined reference value.