In order to process time series data obtained in a substrate processing apparatus having a plurality of processing units, a data processing method includes an evaluation value calculation step of obtaining a score of the time series data by comparing the time series data with reference data, and a result display step of displaying an evaluation result screen including, for each processing unit, a number of score errors being a number of substrates of which score is abnormal, and a pie chart showing a ratio of the number of score errors to a number of processed substrates. A display size of the number of score errors and that of the pie chart change depending on the number of score errors.