INFORMATION PROCESSING APPARATUS, INFORMATION PROCESSING SYSTEM, INFORMATION PROCESSING METHOD AND NON-TRANSITORY COMPUTER READABLE RECORDING MEDIUM

The present invention includes: a first divider that divides time series data measured at a normal time into periodic data in period units; a reference data generator that generates reference data based on a plurality of pieces of periodic data; an allowable error calculator that calculates an allowable error of a divergence value, based on the time series data of the normal time and the reference data the divergence value indicates a degree of divergence from the reference data; a divergence value calculator that calculates a divergence value between time series data for detection, the time series data for detection is a detection object for detection of a non-normal state; and a detector that detects the non-normal state in accordance with whether or not the divergence value is within a range of allowable errors.