To solve a problem that since a conventional system speeds up an access by bus-connecting a plurality of parallel flash ICs, bus wiring is complicated, a substrate cannot be miniaturized and a noise problem is large.

An information processing apparatus comprises a plurality of serial flash memories and a plurality of serial memory interfaces capable of accessing the serial flash memories, and in erasing a sector of a certain serial flash memory, the erasing information of the sector and the backup of sector data are written in a sector of a different serial flash memory.