There are provided an image display device providing a function of changing a screen display direction and an image display method. The image display for providing a 3D image according to a glass-free scheme on the basis of binocular disparity includes: a display unit configured to display a 3D image on a screen; a sensing unit configured to sense whether an event in relation to a change in a disposition direction of a layer generating binocular disparity corresponding to the 3D image and a change in a rendering scheme corresponding to the 3D image; and a control unit configured to change the disposition direction of the layer and the rendering scheme corresponding to the 3D image on the basis of the event.