| 摘要 |
PROBLEM TO BE SOLVED: To regard a web as a reliable composed reference source by identifying a machine which stores an electronic document for the time period corresponding to a time stamp and sending the corresponding electronic document. SOLUTION: A web browser 100 accesses information from one or more persistent web servers 140 and 150 through the Internt or worldwide web environment 130. A uniform resource locator(URL) for identifying a web resource is so reinforced as to include a time stamp. The web browser 100 and the persistent web servers 140 and 150 has additional time stamp parameters and a user refers to an arbitrary web address having a specific target date and time. In this case, the machine which stores the electronic document for the time period corresponding to a time stamp is identified and the electronic document corresponding to the time stamp is sent from the machine.
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