An extraction criterion determination method performed by an extraction criterion determination apparatus includes collecting a log information entry that is in a predetermined period of time and determined to be a specific communication, extracting a communication satisfying a criterion used to extract the specific communication from log information entries from the collected log information entries with reference to a storage unit storing an extraction criterion in which the criterion is defined, determining to adopt the extraction criterion when the ratio of the specific communications to the extracted communications is larger than or equal to a threshold, and performing a control to output the adopted extraction criterion.
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