1. A device, comprising: a reconfigurable circuit whose internal circuit structure is reconfigurable; a generation unit operable to generate circuit information that includes at least area information showing an unconfigured area in the reconfigurable circuit; a transmission unit operable to transmit the circuit information generated by the generation unit and functional information showing a desired function to be established in the reconfigurable circuit to a design data generation apparatus; a reception unit operable to receive, from the design data generation apparatus, design data showing a structure of a partial circuit that is necessary to establish the desired function; and a configuration unit operable to cause the reconfigurable circuit to configure the partial circuit on an area including the unconfigured area in the reconfigurable circuit based on the design data received by the reception unit.