| 摘要 |
PROBLEM TO BE SOLVED: To reduce loads applied to a processor or the capacity of an operation region necessary for a storage device when applying difference data for updating version data by reducing data amounts to be distributed and efficiently managing difference data. SOLUTION: A difference storage part 222 stores first difference data showing a difference between the first edition and second edition of version data s and second difference data showing a difference between the second edition and third edition of the version data s. A difference synthesis part 224 synthesizes the first difference data and the second difference data stored in the difference storage part 222 to generate third difference data showing a difference between the first edition and third edition of the version data s. COPYRIGHT: (C)2011,JPO&INPIT
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