DATA SUMMARIZATION SYSTEM, DATA SUMMARIZATION METHOD AND STORAGE MEDIUM

摘要

Provided is a data summarization system capable of efficiently compressing data that is generated sequentially in a fixed trend and that changes significantly irregularly. An approximate value calculation unit (61) causes each approximation formula to calculate an approximation value of a data value of new data by way of substituting the time of generation of the new data into approximation formulas for calculating approximation values of data values for which each approximation formula has been defined so that the variable is the time of generation, and the valid domain of the variable is an interval of time or a set of points of time. An approximation formula evaluation unit (62) either selects an approximation formula suitable for approximation value calculation of a data value of new data, or determines that there is no approximation formula suitable for approximation value calculation of the data value of the new data on the basis of the data value of the new data and an approximation value calculated for each approximation formula. The update unit (65) updates the valid domain of the approximation formula so as to include the time of generation of the new data when the approximation formula evaluation unit (62) has selected an approximation formula suitable for approximation value calculation of the data value of the new data.