| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a distributed information arrangement system, can dynamically change the number of clusters each of which is a group of nodes caching the same data during operation of the system. Ž<P>SOLUTION: Among node devices 1001 on a network provided with caches storing data, one cluster 1004-1 is formed by a plurality of node devices 1001-1 to 1001-3 storing the same data in the caches. The node device 1001-1 which serves as a representative node determines whether a new cluster creation condition is established, and transmits, when it is established, a creation instruction of new cluster together with a copy of the data to the other node device 1001-4 which has not cached the data yet. The node device 1001-4 stores the received copy of the data in the cache of its own node device, and creates a new cluster 1004-2 with the own node device as a representative node. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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