Provided are a digital broadcast transmitter, a digital broadcast receiver, a stream-processing method for the digital broadcasting transmitter, and a stream-processing method for the digital broadcast receiver. The stream-processing method for the digital broadcasting transmitter includes: configuring a stream in which slots including a plurality of blocks are continuously disposed; and encoding and interleaving the stream to be output as a transport stream, wherein the configuring the stream includes, if slots of a block extension mode 00 are continuously placed, connecting known data placed in predetermined locations of adjacent slots to each other in order to generate a long training sequence.