an engineering device includes a drawing builder for generating a general - purpose part formed by combining functional parts , and a general - purpose part managing section for registering the general - purpose part thus generated in a database and quoting the general - purpose part thus registered in the drawing builder to utilize as a general - purpose part object . the engineering device further includes a reuse section for referring to a general - purpose part object , an operation thereof having been confirmed , within a drawing builder and registers the general - purpose part object in the general - purpose part management section .