| 摘要 |
PROBLEM TO BE SOLVED: To provide a data management device which does not need to separately prepare a machine for verification and can verify at a point of time when a problem occurs even if a document and a music are separately managed. SOLUTION: This data management device searches data which are separately inputted and history managed and data required at a specified time by a history retrieval means 26 and reproduces a state of a file system at that time by a history reproduction means 28. On the other hand, with respect to services which, in accordance with an input (of a retrieval condition or the like) from a simulation user access means 36, performs DB retrieval such as a music retrieval that changes a response (a name of a singer, a name of a song, words of the song, its price or the like) of a display on a browser, it is operated by referring to a virtual clock 30 inside a program executed on a WWW server side such as a CGI 14 and retrieves with a time of the virtual clock as a condition in retrieving. |
