According to the present invention, a digital receiver that processes 3D video data comprises: a receiving unit for receiving a first broadcast signal, including a first 3D service and first signaling data for the first 3D service, via a first channel, and a second broadcast signal, including a second 3D service related to the first 3D service and second signaling data for the second 3D service, via a second channel; a demultiplexer for demultiplexing 3D service data and signaling data from the first broadcast signal and second broadcast signal, respectively; a control unit for acquiring information on the channel for receiving the second broadcast signal on the basis of the demultiplexed first signaling data to control the reception of the second broadcast signal, and controlling the received second broadcast signal on the basis of the second signaling data such that 3D service data in the second broadcast signal are outputted at a predetermined point on a display screen; a decoder for decoding each datum of the 3D service data; a formatter for formatting each datum of the decoded 3D service data in accordance with an output format of the display screen; and a display unit for displaying each datum of the formatted 3D service data on the screen. Another example of a digital receiver that processes 3D video data according to the present invention comprises: a receiving unit for receiving a first broadcast signal, including a first 3D service and first signaling data for the first 3D service, via a first channel, and a second broadcast signal, including a second 3D service related to the first 3D service and second signaling data for the second 3D service, via a second channel; a demultiplexer for demultiplexing 3D service data and signaling data from the first broadcast signal and second broadcast signal, respectively; a control unit for controlling the received second broadcast signal on the basis of the demultiplexed first signaling data such that the second broadcast signal is converted into extended 3D service data and displayed at a predetermined point on a display screen; a decoder for decoding each datum of the 3D service data; a formatter for formatting each datum of the decoded 3D service data in accordance with an output format of the display screen; and a display unit for displaying each datum of the formatted 3D service data on the screen.