PROBLEM TO BE SOLVED: To properly detect an abnormality due to unspecific variation of time series data of such as the communication traffic of a network device.SOLUTION: A time series data abnormality monitoring device 10 includes a calculation unit 11 for obtaining various variation patterns according to different conditions from the time series data by the communication traffic of a network device, and storing the various variation patterns in a variation pattern storage unit 17 while classifying, and an estimation unit 12 for obtaining an estimate, i.e., the value in the future when the time series data does not exist. A comparison unit 13 for acquiring various variation patterns in the past, corresponding to the zone of that estimate, from the storage unit, comparing each of the various variation patterns with the estimate, and obtaining multiple differences of these comparisons, and a selection unit 14 for selecting a variation pattern, corresponding to the smallest difference out of the multiple differences, as an adaptive model, are included furthermore. An abnormality detector 15 for detecting an abnormality when the time series data, corresponding to a variation pattern as its adaptive model, exceeds a predetermined threshold is provided.SELECTED DRAWING: Figure 1
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