The invention discloses a method and device for determining notional words of objects. The method for determining the notional words of the objects comprises the following steps: extracting feature words from an original corpus document of a to-be-analyzed object on the basis of a domain knowledge library of the to-be-analyzed object so as to form a feature word set; carrying out n-gram processing on each feature word in the feature word set to obtain a candidate notional word set, wherein n is selected from one or more preset positive integers; and determining the notational word of the to-be-analyzed object from the candidate notional word set on the basis of the tightness among the feature words forming the candidate notional words, the importance of the candidate notional words in the original corpus document and the similarity between the candidate notional words and the to-be-analyzed object. By applying the method and device provided by the invention, the notional word of the to-be-analyzed object can be automatically determined from the candidate notional word set, so that the human cost is reduced and the notional word extraction correctness is improved.