Provided is a method for quickly obtaining a stationary field from transient analysis of a phenomenon that includes a time-derivative term. Said method, which analyzes a nonlinear field that is periodic in time, uses a computation device to perform transient analysis including a time-derivative term by performing a computation process over a plurality of time steps. Physical quantities (B, C) that have different phases and belong to the same analysis group as a physical quantity (A) to be corrected are prepared, and the value of physical quantity A is corrected to the sum of (1f) times the pre-correction value of physical quantity A and f (f being a value that satisfies 0 f 1 and is more or less fixed throughout the transient analysis) times the value of physical quantity A obtained by inputting the variations over time of physical quantities A, B, and C or physical quantities B and C, in transient analysis, to an equation that relates the steady-state fundamental component of physical quantity A to the variations over time of the steady-state fundamental components of physical quantities A, B, and C or physical quantities B and C over given lengths of time that are less than 1/(2m) of the period. This correction computation is performed for each physical quantity in the same analysis group, thereby quickly obtaining a nonlinear field that is periodic in time.
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