Patent ID: 7594014

Claim:
An abnormality management apparatus connected via a network to a plurality of probes disposed at arbitrary positions in the network, comprising: an abnormality level reception unit that receives information indicating an abnormality level calculated at each of the plurality of probes; an abnormality analysis unit that judges the scale of an abnormality manifesting in the network based upon an average value of abnormality levels indicated at the plurality of probes and deviations relative to the average value; and a result output unit that outputs results obtained at the abnormality analysis unit, wherein: together with the information indicating the abnormality level calculated at each probe, the abnormality level reception unit receives values corresponding to a plurality of parameters obtained at the probe; and the abnormality management apparatus further includes a cause analysis unit that counts the number of probes each indicating a parameter value corresponding to a single parameter or parameter values corresponding to a plurality of given parameters (parameter group) with each of the parameter values contained in a specific range of a normal distribution corresponding to the parameter determined by extracting data from the plurality of probes and judges that an abnormality detected in the network is attributable to a cause related to in the parameter group if the value representing a ratio (number of counted probes)/(total number of probes) is equal to or greater than a predetermined threshold value.