| 摘要 |
In a particular example of a user setting information management method, when a predetermined event occurs, for example, removal of a power source, user setting information stored in the built-in memory of a portable telephone is read out and saved in a backup flash memory. When the predetermined event is cancelled, the user setting information saved in the flash memory is written in the built-in memory of the portable telephone. The flash memory is divided into a plurality of independently erasable blocks. Each divided block is divided into a user setting information area for writing user setting information to be backed up and a block management area for writing block management information for each block. A user setting information log representing a backup order is generated as block management information for each block. Pieces of block management information of all blocks are compared for every occurrence of a predetermined event to identify a block having undergone the oldest backup and a block having undergone the newest backup. After data in the block having undergone the oldest backup is erased, data is backed up in the erased block. Block management information of the erased/backup block is written in the block having undergone the newest backup.
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