1. An X-ray tube adjusting apparatus which remotely adjusts an X-ray tube, comprising: storage means which stores, beforehand, an initial image of a subject to be imaged engraved with a given pattern, said initial image having been imaged by an X-ray inspection apparatus having said X-ray tube with a focal diameter of an electron beam at a target of said X-ray tube adjusted so as to be a predetermined value and an imaging device; acquisition means which acquires a test image of said subject to be imaged that is imaged at a time said X-ray inspection apparatus adjusts the focal diameter via a telecommunications line; and presentation means which presents said initial image stored in said storage means and said test image acquired by said acquisition means in a comparable manner.