Importance

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Abstract

A network system including a plurality of network apparatuses comprises an analysis part configured to analyze a communication status of a communication flow which is a control unit of a communication between terminals. The analysis part includes a reception process part configured to generate and update flow information, and a degradation point identifying part configured to detect degradation of communication quality of the each of the plurality of communication flows. The degradation point identifying part includes an index calculating part configured to calculate a plurality of indexes that are similar to a packet loss rate, the plurality of indexes requiring a smaller amount of data for an analysis and therefore requiring a shorter period of time for calculation. The degradation point identifying part determines whether communication quality of the communication flow has degraded or not based on the indexes.

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First Claim