A method comprising: receiving service information SI that provides information for a receiver to support 3D broadcast services, said service information SI including a plurality of descriptors that provide information related to a broadcast data stream, and said service information SI including a plurality of tables comprising a Program Association Table PAT, a Program Map Table PMT, a Service Description Table SDT, and an Event Information Table EIT; identifying said plurality of descriptors in the received service information SI, said identified plurality of descriptors comprising a first descriptor having a value that indicates a type of first service and a second descriptor having at least one value that indicates a type of second service linked to the first service, the second service including 2D and 3D broadcast services for linkage to the first service which includes 2D and 3D broadcast services, and the first descriptor being included in the Service Description Table SDT, and indicating information regarding whether a service provided by a terrestrial channel is the 2D broadcast service or the 3D broadcast service; identifying first Program Map Table PMT information related to a base view video stream and included in the Program Map Table PMT regarding the 2D broadcast service; and identifying second Program Map Table PMT information related to an extended view video stream and included in the Program Map Table PMT regarding the 3D broadcast service, wherein packet identifier PID information regarding the extended view video stream is recognized by using the second Program Map Table PMT information; processing the base view video stream or both the base view video stream and the extended view video stream using the received service information SI and at least one of the identified plurality of descriptors to support the 2D or 3D broadcast services; and signaling information indicating that the 3D broadcast service related to a 2D broadcasting channel for broadcasting 2D images is being provided when the 2D images are broadcast, and signaling information indicating that the 2D broadcast service related to a 3D broadcasting channel for broadcasting 3D images is being provided when the 3D images are broadcast. receiving service information SI that provides information for a receiver to support 3D broadcast services, said service information SI including a plurality of descriptors that provide information related to a broadcast data stream, and said service information SI including a plurality of tables comprising a Program Association Table PAT, a Program Map Table PMT, a Service Description Table SDT, and an Event Information Table EIT; identifying said plurality of descriptors in the received service information SI, said identified plurality of descriptors comprising a first descriptor having a value that indicates a type of first service and a second descriptor having at least one value that indicates a type of second service linked to the first service, the second service including 2D and 3D broadcast services for linkage to the first service which includes 2D and 3D broadcast services, and the first descriptor being included in the Service Description Table SDT, and indicating information regarding whether a service provided by a terrestrial channel is the 2D broadcast service or the 3D broadcast service; identifying first Program Map Table PMT information related to a base view video stream and included in the Program Map Table PMT regarding the 2D broadcast service; and identifying second Program Map Table PMT information related to an extended view video stream and included in the Program Map Table PMT regarding the 3D broadcast service, wherein packet identifier PID information regarding the extended view video stream is recognized by using the second Program Map Table PMT information; processing the base view video stream or both the base view video stream and the extended view video stream using the received service information SI and at least one of the identified plurality of descriptors to support the 2D or 3D broadcast services; and signaling information indicating that the 3D broadcast service related to a 2D broadcasting channel for broadcasting 2D images is being provided when the 2D images are broadcast, and signaling information indicating that the 2D broadcast service related to a 3D broadcasting channel for broadcasting 3D images is being provided when the 3D images are broadcast.