1. A system for capturing a pupil, the system comprising: an image obtainer configured to obtain front image data of a user; an 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, wherein the lighting provided by the illuminator is configured such that 70% or more of pixels within the image data obtained by the image obtainer have a maximum pixel value, and wherein the pixels having intensity less than the predetermined reference value correspond to the pupil, and the pixels having intensity equal to or more than the predetermined reference value correspond to a background.