A device for supervisory control of a network having a plurality of network elements, comprising: a communication interface which is connected to each of a plurality of element groups, wherein the plurality of network elements is grouped into the plurality of element groups; and a controller for controlling supervisory control information in element group units depending on a communication condition change for at least one network element belonging to each element group, wherein the supervisory control is performed according to the supervisory control information, characterized in that the controller comprises: a storage for storing the supervisory control information for each of the plurality of element groups wherein the supervisory control information includes an optimal transmission interval and an optimal response wait time for each of the plurality of element groups, wherein the optimal transmission interval is a transmission interval at which an inquiry signal is transmitted and the optimal response wait time is a response wait time which is a waiting time for which a response signal to the inquiry signal is waited for; wherein the optimal transmission interval and the optimal response wait time are optimized for each of the plurality of element groups; a detector (104, 105) for detecting the communication change for each element group by measuring a response time for each network element of the element group and comparing an average of measured response times to an average of normal response times for the element group; and an update controller (107, 108) for updating the supervisory control information of an element group when the communication condition change for the element group has been detected, by recalculating the optimal transmission interval and the optimal response wait time of the element group when the communication condition change for the element group has been detected. a communication interface which is connected to each of a plurality of element groups, wherein the plurality of network elements is grouped into the plurality of element groups; and a controller for controlling supervisory control information in element group units depending on a communication condition change for at least one network element belonging to each element group, wherein the supervisory control is performed according to the supervisory control information, characterized in that the controller comprises: a storage for storing the supervisory control information for each of the plurality of element groups wherein the supervisory control information includes an optimal transmission interval and an optimal response wait time for each of the plurality of element groups, wherein the optimal transmission interval is a transmission interval at which an inquiry signal is transmitted and the optimal response wait time is a response wait time which is a waiting time for which a response signal to the inquiry signal is waited for; wherein the optimal transmission interval and the optimal response wait time are optimized for each of the plurality of element groups; a detector (104, 105) for detecting the communication change for each element group by measuring a response time for each network element of the element group and comparing an average of measured response times to an average of normal response times for the element group; and an update controller (107, 108) for updating the supervisory control information of an element group when the communication condition change for the element group has been detected, by recalculating the optimal transmission interval and the optimal response wait time of the element group when the communication condition change for the element group has been detected. a storage for storing the supervisory control information for each of the plurality of element groups wherein the supervisory control information includes an optimal transmission interval and an optimal response wait time for each of the plurality of element groups, wherein the optimal transmission interval is a transmission interval at which an inquiry signal is transmitted and the optimal response wait time is a response wait time which is a waiting time for which a response signal to the inquiry signal is waited for; wherein the optimal transmission interval and the optimal response wait time are optimized for each of the plurality of element groups; a detector (104, 105) for detecting the communication change for each element group by measuring a response time for each network element of the element group and comparing an average of measured response times to an average of normal response times for the element group; and an update controller (107, 108) for updating the supervisory control information of an element group when the communication condition change for the element group has been detected, by recalculating the optimal transmission interval and the optimal response wait time of the element group when the communication condition change for the element group has been detected.