| 摘要 |
PROBLEM TO BE SOLVED: To eliminate the need of the unnecessary transfer of common data and to suppress the narrow problem of a network band by storing again common data of a server node and update information in the cache of a client node when update information differs. SOLUTION: When the common file of a server node 5 is not stored in the cache of a client node 1(3), an entry generation part 101 stores the common file of the server node 5 and update information in the cache of the client node 1(3). When the common file of the server node 5 is stored in the cache of the client node 1(3), an update information request part 102 requests update information in the server node 5 of the common file. When update information in the server node 5 differs from update information in the client node 1(3), an entry update part 103 stores again the common file of the server node 5 and update information in the cache of the client node 1(3).
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