1. A connection consistency check processing method for a computer to check whether components linked by lines in a system structure diagram are actually connectable to each other or not based on electronic information of the system structure diagram, the method comprising: a step of extracting a connector group of components to be connected linked by lines on the system structure diagram from the inputted electronic information of the system structure diagram; a step of reading, for the respective extracted connectors to be connected with respect to connectors used to connect components, scripts describing fixed characteristics, a connection judging expression of the fixed characteristics, variable characteristics, and a connection judging expression of the variable characteristics from a characteristic/judging expression script storage unit that stores definition information describing in script according to a predetermined grammatical rule, fixed characteristics showing shape and state characteristics, a connection judging expression of the fixed characteristics to judge whether the fixed characteristics are connectable values or not, variable characteristics showing electric characteristics and a connection judging expression of the variable characteristics to judge whether the variable characteristics are connectable values or not; a step of evaluating, for each cable registered beforehand, values of the fixed characteristics of the connectors to be connected according to the connection judging expression of the fixed characteristics and judging whether their connections are good or not, looking up a transfer function script storage unit that stores definition information describing in script according to a predetermined grammatical rule, a transfer function that shows how to transfer the variable characteristics and the connection judging expression of the variable characteristics between connectors to be connected or between one end and the other end of a cable with respect to connectors and cables registered beforehand, deforming the variable characteristics and the connection judging expression of the variable characteristics of the connection source according to the transfer function and transferring the variable characteristics and the connection judging expression of the variable characteristics to the transfer target, which is the connected other party, repeating processing of evaluating the variable characteristics according to the connection judging expression of the variable characteristics and judging whether their connections are good or not for each connected portion, and thereby certifying that there is connection consistency when there exists a cable judged to be connectable in all the processing and certifying that there is no connection consistency when there exists no cable judged to be connectable in all the processing; and a step of outputting information on whether there is connection consistency or not.