An FPGA-information managing unit included in a circuit-designing CAD apparatus retrieves FPGA information, such as pin-assignment information and attribute information, that is created by an FPGA-designing CAD apparatus. A library creating unit creates a symbol library by using the FPGA information. A pin-swap processing unit retrieves pin swap information from a package-designing CAD apparatus, and reflect the pin swap in the symbol library, the FPGA information, a circuit diagram, and a constrained condition.