Disclosed is a data processing device for processing data representing an operation status of a pattern sewing system which includes at least one pattern sewing machine alternately operated by a plurality of operator groups. The data processing device may include a time zone setting device which sets a plurality of time zones. A plurality of operator groups operate the pattern sewing machine during a plurality of time zones, respectively. There is provided a log data recording device which records an operation status of the pattern sewing machine as log data, and an operation data creating device which creates operation data representing a predetermined operation parameter for each of a plurality of operator groups based on a plurality of time zones set by the time zone setting device and the log data recorded by the log data recording device.