A device is provided with a unit that stores shape and state characteristics of connectors, their electric characteristics, a judging equation to judge whether their connections are good or not, and information defined in script; and a unit that stores information defined in script of transfer functions to transfer the electric characteristics and the judging equation along a cable, wherein the connection consistency of the cable to connect connectors of the components is checked by analyzing characteristics of each connector, and scripts of the judging equation and the transfer functions; and a suitable cable candidate is selected and a processing is achieved by making use of scripts and an algorism unified for connectors and cables with various characters.