The present invention relates to a method for generating, by a transmission device, a packet in a broadcasting and/or communication system, the method comprising the steps of: generating a first source symbol block consisting of one or more source symbols with the same length using a source packet block consisting of one or more source packets; performing a forward error correction (FEC) coding operation on the first source symbol block; generating a second source symbol block containing information about each source packet constituting the source packet block; and generating a second recovery symbol block with one or more recovery symbols by performing an FEC coding operation on the second source symbol block.