A display device for managing power supply in an active stand-by mode is disclosed. More specifically, the display device includes a signal mode supply unit which provides control signals for a mode in which a digital cable ready (DCR) feature is selected or for a mode in which a digital video recorder (DVR) feature and a signal processing circuit are selected. Furthermore, the device includes a stand-by power supply unit for supplying power for operating a micro computer and for operating at least one DCR feature if the DCR feature is selected, and a multi-power supply unit for supplying power for operating at least one DVR feature and for operating a signal processing circuit if the DVR feature is selected.