| 摘要 |
A reference value calculation unit calculates, as a reference value, the value in which the mean value, the mode value and the median are averaged by obtaining the mean value, the mode value and the median for the year at which the document containing each keyword is published, based on the annual publication data inputted into a data input unit. A data sort unit sorts the annual publication data for each keyword, based on the calculated reference value. And a data display unit creates a display data based on the sorted annual publication data and displays the created display data on a screen.
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