The present invention includes acquiring an event point which is part of a reference waveform and which satisfies a predetermined condition, and extracting a singular point being part of the reference waveform in a period to which the acquired event point belongs, and has a value that indicates predetermined change, acquiring, when part of a target waveform corresponds to the event point, the part as a correspondence event point, and detecting a correspondence singular point in the period of the target waveform to which the correspondence event point belongs and corresponding to the singular point of the reference waveform, calculating a dissimilarity degree between a correction waveform generated based on the above four points and the reference waveform and the target waveform newly acquired, determining whether the target waveform has abnormality based on the dissimilarity degree, and outputting abnormality information.
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