Improve the accuracy of gaze estimation based on images. The gaze estimation apparatus 100 includes an estimation unit 110 that estimates the gaze of a face included in a face image using a plurality of estimators, first condition information that includes conditions related to imaging of the face image, and each of the plurality of estimators. A determination unit 120 that determines a line of sight of the face based on a plurality of second condition information including a condition corresponding to the above and a plurality of estimated lines of sight.画像に基づく視線推定の精度を向上させる。視線推定装置１００は、顔画像に含まれる顔の視線を複数の推定器で推定する推定部１１０と、顔画像の撮像に関する条件を含む第１の条件情報と、各々が複数の推定器のいずれかに対応する条件を含む複数の第２の条件情報と、推定された複数の視線とに基づいて顔の視線を決定する決定部１２０とを含む。
