Display system and control method thereof

The host device that the present invention provides a digital data; It relates to a display system and a control method for a display device for displaying by processing the digital data provided from the host device. The display system includes a connecting unit provided respectively with the host device and the display device causes the host device and each of the different detection signals in accordance with the interconnect if the interconnect, and the host device and the display device to the display device; Provided to the host device, in the case to determine whether the display device is HDCP (High-bandwidth Digital Content Protection) is authenticated, and the HDCP authentication error occurs, and to block the delivery of the digital data, detects which is generated through the connection If it is determined by signals which the display device is changed from disconnected to connected host controller to resume data communication with; If provided on the display device, the display device in the predetermined error condition for the HDCP authentication error occurs, a display control unit for the detected signal such that the display device recognized by the separate state to the connected state occurs via the connecting portion and it characterized in that. In this way, the display device is to prevent the output data blocks to a display device from a communication error, or automatically by the host device when the reset state due to such a power that can cause a HDCP authentication error.