The first purpose is that it is possible to compose Quine's 'plane ontology'.
For contemporary scholers, whether some beings exists or not is not core question in Aristotle's ontology. They think he makes the question to be 'a priority problem'. However contemporary analytical metaphysicists care about not the priority problem but the lists of different beings. I try to question their basic settings and so argue that Aristotle makes whetere some beings exists or not to be core question. The first purpose is that it is possible to compose Quine's 'plane ontology'.