| 摘要 |
PROBLEM TO BE SOLVED: To visually confirm how critical an error is by displaying a graph of a function obtained by a function calculating means and displaying a symbol showing how critical an error calculated by an error calculating means on the graph. SOLUTION: A function calculating means on a CPU 2 obtains a function showing the correlation between two sets of numerals as elements and substitute the numeral representing the elements constituting one set and the elements constituting the other set in the obtained function and an error calculating means on the CPU 2 calculates an error. At a display part 4, the graph of the function obtained by the function calculating means is displayed and on the graph, a symbol showing how critical the error calculated by the error calculating means is displayed. Consequently, it is made possible to visually and easily confirm how critical the error is.
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