eventh aspect of the invention is characterized in that the threshold at the power terminal in the circuit for analyzing the inter-block power wiring is the maximum among the thresholds for the terminal in the functional block in the semiconductor integrated circuit and inter-block power wiring. With this configuration, the threshold at the power terminal in the circuit for analyzing the inter-block power wiring is set to the maximum among the thresholds for the terminal in the functional block in the semiconductor integrated circuit and inter-block power wiring. This prevents useless calculation and allows an efficient check. The 