In an apparatus and a method for displaying a three-dimensional augmented reality, an apparatus to display a three-dimensional augmented reality includes an object area detecting unit to detect a first object area of a left image frame of a three-dimensional image and a second object area of a right image frame of the three-dimensional image based on a selected object of the three-dimensional image; and a frame adjusting unit to adjust the left image frame and the right image frame to change a three-dimensional effect of the selected object.