| 摘要 |
PROBLEM TO BE SOLVED: To provide a character string compression system which is improved in compressibility as a character string compression system which makes use of Ziv Lempel method. SOLUTION: For this character string compression system which uses the Ziv Lempel method, a character string 11 is compressed by referring to an existing external dictionary 13. As the external dictionary, a dictionary, wherein IDs and character strings are stored in pairs, e.g. a zip-code dictionary is usable. In this case, when a match between the character string before compression and the zip-code dictionary is obtained, an address and a character size, and a zip code can be stored in the compressed character string 12.
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