A first mathematical expression indicating a dependence of SER on an information storage node diffusion layer area at the same information storage node voltage Vn is derived with a use of a result of measuring a relationship between SER and the information storage node diffusion layer area of a storage circuit or an information holding circuit composed of MISFET using a plurality of information storage node voltages Vn as a parameter. Then, a second mathematical expression is derived from the measurement result by substituting a relationship indicating a dependence of SER on an information storage node voltage at the same information storage node diffusion layer area Sc into the first mathematical expression. SER can be calculated by substituting a desired information storage node diffusion layer area and a desired information storage node voltage of a storage circuit or an information holding circuit into the second mathematical expression.

 
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