The present invention provides a network management system and management method for managing a network to which a plurality of network equipments are connected, and collects management information from the network devices using a polling engine, and manages the correlation between the collected management informations. Analyze in real time and manage and supervise the network using the collected management information and analyzed correlation values.;In the correlation analysis, measurement values for each time slot of management information to be compared are assigned to the X and Y axes, respectively, and intersection points of the respective measurement values are displayed in the same time zone, thereby obtaining a correlation value between the management information.
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