COMMUNICATION NETWORK FAILURE CAUSE ANALYSIS SYSTEM, FAILURE CAUSE ANALYSIS METHOD, AND FAILURE CAUSE ANALYSIS PROGRAM

A failure cause analysis system for estimating a cause of a failure in a communication network from recorded contents of internal processing of a communication apparatus includes: feature extraction means for extracting a statistical feature of the recorded contents at a time of occurrence of a failure; and failure cause estimation means for estimating a failure cause based on similarity between a statistical feature of the recorded contents that is acquired at a time of occurrence of a past failure with a known failure cause and the statistical feature of the recorded contents that is acquired at the time of occurrence of the failure. The failure cause analysis system of a communication network provided can acquire the correspondence between failure features and failure causes from past failure cases irrespective of the number of cases as to communication network failures that are detected from process logs retained in communication apparatuses, and quantitatively incorporate the range of dispersion of the features into a judgment to estimate the cause of occurrence of a failure.