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Please predict whether this patent is acceptable.PATENT ABSTRACT: Disclosed is an event correlation detection system that can automatically set a minimum supporting rate and a minimum reliability rate so that an erroneous detection rate is reduced to an allowable level. The event correlation detection system 101 includes an arrival rate calculation unit 102 calculating an arrival rate, an occurrence probability calculation unit 103 calculating a first probability, a threshold calculation unit 104 calculating the minimum supporting rate and the minimum reliability rate for a dependency rule, and an event association rule engine unit 160 detecting an association among a plurality of event types.