To enable the setting of a suitable threshold for a component of each of apparatuses configuring a system. By using management software, a threshold for monitoring the performance of an apparatus to be monitored is set beforehand. When an acquired performance value exceeds the threshold, the acquired performance value is detected as a performance fault event. Further, the management software has a correlation analysis rule representing a causal relationship between the performance fault events in the managed apparatus. When detecting an event, the management software performs fault cause analysis processing to specify a fault cause apparatus and an apparatus (affected apparatus) affected by the fault from a plurality of received events.