The present invention relates to a method and to a system for automatically extracting relation triplet information for building ontology from texts with grammatically correct plain declarative sentences. The method for automatically extracting relation triplets through a dependency grammar parse tree according to the present invention comprises: a first step of performing syntactic parsing on an objective sentence to generate a dependency grammar parse tree; a second step of preprocessing the dependency grammar parse tree generated in the first step to convert the tree into a format suitable for relation extraction; and a third step of traversing, in a post-order manner, the dependency grammar parse tree converted in the second step to automatically extract relation triplets.
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