| 摘要 |
<P>PROBLEM TO BE SOLVED: To reduce the load of preparation processing for updating information of tree structure which expresses hypertext structure. <P>SOLUTION: A tree structure information collection device 16 installed in an intra-office network has a preceding document table 204 and a preceding link table 206 which respectively indicate documents and links existing in the hypertext structure at preceding contents updating timing. When it becomes updating timing, a collection part 162 collects documents and links from the intra-office network and prepares a post-collection document table 210 and a post-collection link table 212 which respectively indicate change of state of respective documents and respective links between the preceding updating timing and the current updating timing from comparison between the collected results and the preceding tables 204, 206. A differential data preparation part 164 finds out a link to be passed at the time of retrieving a link of the hypertext structure in a breadth first order and the change of state of linked documents from the tables 212, 210, retrieves difference information corresponding to the combination of their change of state from a difference information determination table 208 and adds the retrieved information to tree structure differential data 220. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
