Measurement agents in a network failure detecting system each configure a group together with other measurement agents that receive a service from the same provision server, and form a link to create a tree structure with a predetermined measurement agent in the group at its top. The measurement agent then receives measurement results from the other measurement agents in the group, and narrows down candidates of a failure location based on the received measurement results. The measurement agent transmits the narrowed candidates of the failure location to a surveillance server or one of the other measurement agents. The surveillance server then receives the transmitted candidates of the failure location, and specifies the failure location based on the received candidates of the failure location.
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