PURPOSE:To automatically select the most economic circuit constitution of which an effect to the existing circuit constitution is minimum by executing the recombination of the circuit constitution and the simulation of a rate calculation when the rate information and so on of circuit traders are inputted. CONSTITUTION:An input part 1 inputs information necessary for simulation. In a processing part 2, the simulation that the circuit rate of a basic constitution and the rate of the constitution that additional terminals are branched to the existing circuit are compared in order on the whole existing circuits (constitutions 2 to 4) and that the most economic circuit constitution is found is executed with a constitution 1 that an additional terminal 31 is connected with a direct circuit 32 as the basic constitution based on the inputted information as shown in a separate figure. In the processing part 2, the whole rate of the optimal economic circuit constitution of which the whole rate till present time becomes minimum and the whole rate of the changed constitution. An output part 3 stores the circuit constitution information of a selected optimal economic design result in a magnetic disk device and outputs to a printer at the same time.
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