There is provided semiconductor memory capable of reconfiguring an area to be given an authentication key and access limitation, and there is implemented an information distribution system having an advanced security function using the semiconductor memory. A method for generating a channel list at a digital broadcasting receiver includes scanning a plurality of broadcast channels, determining whether there exist one or more channels of the same broadcast service among the scanned broadcast channels, and linking the channels of the same broadcast service based on a priority. Note that the oxide semiconductor layer is an oxide semiconductor layer which is highly purified by thoroughly removing impurities which become electron suppliers. The gaseous fuel flows through the mixer element and then through a plurality of openings formed in an exposed proximate end of the mixer element.