Patent ID: 8516431

Claim:
A design rule check system comprising: a design rule check unit that performs a design rule check on the basis of wiring information relating to a wiring pattern of each net and a design rule which includes a constraint condition of a wiring pattern; and a screening processing unit which generates error information about an error in said each net for each combination of design rule check items and operating frequencies of each net based on a result of said design rule check and outputs said error information to an indicating device; wherein said screening processing unit outputs error list data of nets which have become an error about a selected combination of the check item of said design rule and operating frequency of said each net; wherein said screening processing unit selects a combination of check items of said design rule and operating frequencies of said each net based on error selection default information which indicates a combination with a high priority of error correction among combinations of check items of said design rule and operating frequencies of said each net; wherein said error selection default information is a combination with a high effect of EMI reduction among combinations of check items of said design rule and operating frequencies of said each net.