A method of operating a video display device including a display unit is provided. The method includes: playing uncompressed audio-visual content through a first layer of the display unit; obtaining content information on the uncompressed audio-visual content based on some of the uncompressed audio-visual content; obtaining an enhanced service based on the content information; and playing an obtained enhanced service through a second layer of the display unit, wherein the first layer and the second layer are overlapped each other.