An apparatus for and a method of processing a multi-channel audio signal using space information. The display cover is preferably configured to shift an image displayed on the display panel relative to an observer to obscure a bezel surrounding the display panel. A system includes a policy retriever comparing a source policy to one to an intermediate policy to determine whether the source policy is compatible with the intermediate policy. A distance between a side surface of a portion of the second flange and a center axis of the rivet is greater than the distance between a side surface of the first flange and the center axis of the rivet. A packetizing unit packetizes the stream and transmits the packetized stream to the host terminal. The liftinglowering unit includes a magnet inserted into a bottom surface of the lamp member, and an electromagnet inserted into a top surface of the block unit, facing the magnet.