Digital broadcasting system and data processing method

A method of processing broadcast data in a broadcast transmitting system, the method comprising:

• encoding broadcast service data for a broadcast service, the broadcast service data being included in at least one data unit, wherein the at least one data unit includes an M-byte header, k bytes of stuffing data and an (N−M−k)-byte payload, wherein the header includes stuffing indication information indicating whether the stuffing data are included in the at least one data unit, and wherein N and M are integers, and k is equal to or greater than 0;
• interleaving the encoded broadcast service data;
• encoding signaling data for signaling the broadcast service data;
• and
• modulating the interleaved broadcast service data and the encoded signaling data.

A broadcast transmitting system for processing broadcast data, the broadcast transmitting system comprising:

• an encoder for encoding broadcast service data for a broadcast service, the broadcast service data being included in at least one data unit, wherein the at least one data unit includes an M-byte header, k bytes of stuffing data and an (N−M−k)-byte payload, wherein the header includes stuffing indication information indicating whether the stuffing data are included in the at least one data unit, and wherein N and M are integers, and k is equal to or greater than 0;
• an interleaver for interleaving the encoded broadcast service data;
• a signaling encoder for encoding signaling data for signaling the broadcast service data;
• and
• a modulator for modulating the interleaved broadcast service data and the encoded signaling data.