| 摘要 |
PROBLEM TO BE SOLVED: To provide a monitoring server capable of reducing possessed data amounts for a playback reproduction function.SOLUTION: A monitoring server includes: a document history database 12 for recording the state data of monitor object devices 31 and 32 at a fixed point of time; and an operation history database 11 for recording the state data in state change of the monitor object devices 31 and 32. A playback function management part 15 allows an operation terminal 2 to display the playback reproduction screen of the states of the monitor object devices 31 and 32 about the date designated by an operation terminal 2, and when the state data on the date designated by the operation terminal 2 are not present in the document history database 12, performs the playback reproduction of the states of the monitor object devices 31 and 32 on the designated date by using the state data of the document history database 12 at the previous fixed point of time and the state data in the state change of the operation history database 11 since the previous fixed point of time until the designated date. |
