| 摘要 |
PROBLEM TO BE SOLVED: To reduce the size of difference data in updating (version-up) the data such as a program. SOLUTION: In a difference data generation device 100, a first difference data generation section 102 reads old data 192 and new data 191 stored on a data storage section 190 to generate difference data 193 before conversion using a conventional Move command code and an ADD command code. A second difference data generation section 130 generates difference data 194 after conversion using a particular Move command code not updating the value of the processing pointer of the new data after Move processing and using a Skip command code only updating the value of the processing point of the new data on the basis of the difference data 193 before conversion. A difference data output section 140 compares the data size of the difference data 193 before conversion with that of the difference data 194 after conversion to output the difference data having a smaller data size as the difference data. COPYRIGHT: (C)2006,JPO&NCIPI
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