Abstract: A main device including an interface module configured to receive first and second control signals from a mobile terminal and to transmit the received control signals to a controller, the mobile terminal being connected for data communication with the main device; and the controller configured to receive first AV (Audio/Video) data, decode the received first AV data, receive the first control signal, transmit the decoded first AV data to the mobile terminal according to the received first control signal, receive the second control signal, receive second AV data according to the received second control signal, decode the received second AV data, and transmit the decoded second AV data to the mobile terminal.

Abstract: A display device including a display configured to display multimedia contents; a wireless communication unit configured to wirelessly communicate with at least one external mobile terminal; a camera unit configured to sense an eye movement of a user holding the mobile terminal; and a controller configured to receive indication signals from the mobile terminal indicating at least one of a grip pattern and eye movement of the user holding the mobile terminal, and to control a streaming operation of streaming the multimedia contents displayed on the display to the mobile terminal.