DATA PROCESSING APPARATUS FOR CLUSTERING TIME-SERIES DATA BASED ON GENERATED REFERENCE VALUES AND DATA PROCESSING METHOD FOR SAME

To obtain a clustering result which is less unnatural to the user, a data processing apparatus clusters at least one data arranged in time-series; generates, if new data is added, a reference value for defining a group division criterion in the clustering using at least one existing data that exists forward of the new data in time-series after a forward boundary; and determines based on the reference value whether a group division boundary exists between the new data and existing data positioned immediately before the new data.