A circuit design apparatus for designing an LSI including a memory circuit for storing data and an error protection circuit for performing an error protection over the data stored in the memory circuit on the basis of design information, the circuit design apparatus includes: an extracting unit for extracting information of configuration of the memory circuit with error protection circuit from the design information; and a circuit arrangement controller for determining whether to insert a check circuit for supplying a check signal into the memory circuit to verify the error protection circuit on the configuration information.