Data processing device and data processing method

A data processing device comprising:

• an acquisition unit that acquires a plurality of types of time-series data over a target period related to an operation of a target device;
• a division unit that divides the target period into a plurality of operation periods according to operation conditions;
• a specifying unit that specifies a standard condition, which is a standard operation condition, for each operation period;
• a calculation unit that divides each operation period into a plurality of constant performance periods in which a performance of the target device is considered to be constant, that performs selection of the time-series data based on the standard condition for each constant performance period, and that calculates a predetermined representative value based on the time-series data extracted by the selection;
• and
• a correction unit that sets an overlap period including a boundary between two adjacent operation periods, that performs selection of the time-series data within the overlap period for each standard condition based on each standard condition specified for the two operation periods, and that corrects the representative value in at least one of the two operation periods based on a result of calculating each representative value based on each piece of time-series data extracted by the selection.