1. An apparatus that controls gaze tracking, comprising: an imaging device having an image sensor divided into a plurality of zones; and a gaze tracking controller configured to: determine a lens point spread function (PSF) and an image sensor PSF of the imaging device, respectively, using images for each zone acquired from image elements disposed in each zone of the image sensor; and estimate illumination reflection points using an imaging device PSF determined from the determined lens and image sensor PSFs while detecting user gaze using the imaging device.