PURPOSE:To simultaneously display many trend graphs on one display picture plane by providing a trend graph selection part. CONSTITUTION:A trend data group change processing part 101 takes out color selection information from input operator input information, decides corresponding group information, prepares preference of nomination, and sends them to a trend graph selection processing part 102. The processing part 102 compares in order the sent group information with the trend group information in the trend display information, the preference of nomination with the preference of display, so as to select display information, and sends the selected trend display information to a display information change processing part 103. The processing part 103 changes the trend display color information in the sent trend display information to the selected display color information previously stored in a computer, prepares point display information from the process input number in the trend display information, and sends it to a trend display demand processing part.
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