A system for transmitting a transport stream including a robust stream is provided. The transmitting system includes an adaptor for, when receiving a first stream, making a space in the first stream to insert a second stream; a Reed-Solomon (RS) encoder for RS-encoding the input second stream; a Cyclic Redundancy Check (CRC) processor for converting the RS-encoded second stream to a stream comprising an added CRC bit sequence; and a stuffer for inserting the stream to the space in the first stream and outputting a transport stream. Hence, the robust stream can be efficiently transmitted.