The invention discloses a computer automatically implemented element-noun reference numeral acquiring method that acquires an element-noun reference numeral of a claim-element-noun from a patent claim. The computer automatically implemented element-noun reference numeral acquiring method has an element-noun reference numeral retrieving step and an element-noun reference numeral correlating step. The element-noun reference numeral retrieving step retrieves a claim-element-noun and/or a specification-element-noun according to a rule related to a noun-initial word and part of speech. In addition, the element-noun reference numeral retrieving step retrieves a specification-element-noun possible word string according to an element-noun determining word. The element-noun reference numeral correlating step builds a correlated relationship between the claim-element-noun reference numeral retrieved from the element-noun reference numeral retrieving step and the claim-element-noun.
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