| 摘要 |
PROBLEM TO BE SOLVED: To select an optimum grade of a printed circuit board according to the ratio of the total wiring length that is possible to be wired on the circuit board to the total wiring length to be wired on the board. SOLUTION: An input part 32 inputs the information on a printed circuit board to be designed, the information on the parts to be mounted on the circuit board and the parts connection information, a storage part 38 stores the information which are acquired from the past designs of circuit board in addition to the said circuit board information, parts information and connection information, a display part 36 displays various types of design information including those inputted information and an operation/control part 34 which carries out a prescribed operational processing by means of various information stored in the part 38 and also controls the parts 32, 36 and 38 respectively are included. In such a constitution, the ratio is found, from those information of the part 38, of the total wiring length that is possible to be wired on the circuit board to the total wiring length that is necessary for connecting the parts together and a grade of the circuit board is selected according to this decided rate.
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