Information processing apparatus for and method of transmitting and/or receiving broadcast signal

There is provided an information processing apparatus/method, which error detection or correction encodes information to be distributed in a description format used in a multimedia network, and    which error detection or correction encodes at least a portion in the header in the information to be distributed with higher redundancy than the entity in the information to be distributed, multiplexes the encoded information to be distributed in a broadcast signal, and transmits the multiplexed signal. There is also provided an information processing apparatus/method, which inputs information to be distributed in a description format used in a multimedia network, multiplexes the information to be distributed in a broadcast signal, and transmits the multiplexed signal, and    which transmits a portion of the header in the information to be distributed at least a plurality of number of times while the entity in the information to be distributed is transmitted. There is also provided an information processing apparatus/method, which error detection or correction encodes information to be distributed in a description format used in a multimedia network, multiplexes the encoded information to be distributed in a broadcast signal, and transmits the multiplexed signal, and    which can transmit a plurality of kinds of information as an entity in the information to be distributed, and uses different error detection or correction ability in correspondence with the kind of information. There is also provided an information processing apparatus/method, which inputs information data, and a check code for correcting an error of the information data, detects the error state of the information data, sets an allowable error state of the information data, and controls processing for the input information data in accordance with results in the setting step and the detection step.