Patent ID: 6763381
Filing Date: 2004-07-13
Classification: H04L

Abstract:
A supervisory control system comprising:a supervisory control apparatus; one or more supervised apparatuses connected to the supervisory control apparatus via a network; and a supervisory control terminal connected to the supervisory control apparatus via a network, wherein: the supervisory control apparatus issues a supervisory control instruction to the one or more supervised apparatuses upon receipt of a control request from the supervisory control terminal to supervise the one or more supervised apparatuses, and supplies the supervisory control terminal with response information received as a response from the one or more supervised apparatuses; the supervisory control apparatus comprises a cache storage unit which caches response information as cache information to be sent to the supervisory control terminal, and a cache management unit which manages cache information stored in the cache storage unit; and the supervisory control apparatus caches cache information in the cache storage unit, the cache information being response information of a supervised apparatus designated by a supervisory control request from the supervisory control terminal, transmits that cache information to the supervisory control terminal when the response information corresponding to the supervisory control request from the supervisory control terminal exists as cache information in the cache storage unit, and issues a supervisory control instruction to the designated supervised apparatus to obtain response information and transmits the thus obtained response information to the supervisory control terminal when the response information corresponding to the supervisory control request from the supervisory control terminal does not exist in the cache storage unit; wherein the supervisory control apparatus only caches response information designated as cache information by the supervisory control request.