PURPOSE:To easily execute arrangement correction while considering the limit value of current density by providing a storing means, arrangement information display means and limit value over display means. CONSTITUTION:A storing means 12 stores the arrangement information of a block as storing arrangement information. An arrangement information display means 13 displays the storing arrangement information onto a practical plane area as display arrangement information. A limit value over display means 14 calculates the number of transistors connected to a power supply bus in respect to the plural rows and columns of the practical plane area according to the storing arrangement information, and calculates the current density in each row and column according to the calculated number of transistors. By comparing the calculated current density in each row and column with the limit value of the current density in the current bus to each row and column, the row or column with the current density exceeding the limit value is displayed on the plane area as a limit value over cell. Thus, the arrangement of the block can be easily corrected while considering the limit value of the current density.
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