1. A broadcast signal transmitting apparatus, comprising: a first encoder configured to generate a video stream of a frame compatible 3-Dimensional Television (3DTV) service; a second encoder configured to generate signaling information for signaling the video stream, wherein the signaling information includes first information indicating whether the video stream includes a frame packing arrangement supplemental enhancement information (SEI) message, service type information indicating that a service type of the video stream is a High Efficiency Video Coding (HEVC) frame compatible 3DTV service, and a plurality of component descriptors indicating a type of component stream with respect to the video stream, wherein each of the plurality of component descriptors includes: component tag information includes information for identifying component stream, first stream content information, second stream content information indicating a stream type of the component stream in combination with the first stream content information, and component type information indicating a component type of the component stream, and wherein a combination of the first stream content information, the second stream content, and the component type information indicates the type of the component stream; and a transmitter configured to transmit a broadcast signal comprising the video stream and the signaling information.