An electronic device includes a display configured to display a three-dimensional image, a camera configured to photograph a real image, and a controller configured to generate an image signal based on the real image and augmented reality (AR) image data and to provide the image signal to the display, the controller including a multi-view image generator configured to convert the AR image data into multi-view AR images, a graphics processor configured to compose each of the multi-view AR images with the real image to generate multi-view composition images, and a processor configured to control a multi-view virtual camera and the graphics processor, to convert the multi-view composition images into the image signal, and to provide the image signal to the display.