A viewfinder apparatus includes a window on which a reference mark is disposed; a photography unit (e.g., an eye imaging camera) configured to photograph eyes of a user via the window; and a controller configured to detect a location where the photography unit has been moved, based on a location of the reference mark included in a first image captured by the photography unit before the photography unit is moved and a location of a reference mark included in a second image captured by the photography unit after the photography unit is moved, wherein the controller tracks the eyes of the user by using the detected location.