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The existence is one of the ultimate concepts in the studies of western philosophy. Almost all well-known philosophers in history had their own understandings of this concept. As a new philosophical form in new era, the philosophy of information states that philosophy of information and information science should develop together. The existence in philosophy needs to be redefined. The segmentation of existential field should be the first step to tackle with the issue of existence and non-existence. In the view of the philosophy of information, there are four levels of the existence: A. objective direct existence, B. objective indirect existence, C. subjective for-itself existence and D. subjective regenerated existence. The existential levels of a certain thing cover four levels in part or in its totality. Consequently, the nonexistence, as the opposite concept of the existence, has also changed. The existence and non-existence can be transformed into each other, with five properties in the process, those are: continuity, developmental feature, contingency, retrospective feature and predictability.