Patent ID: 11874873
Assignee: NEC CORPORATION
Field: Computer technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 3:
4. The knowledge expansion system according to claim 1, wherein
the subgraph extraction unit extracts, from the document structure graph including nodes each having node type information indicating a type of the node, a subgraph having at both ends a node in the document structure graph containing one of two words having a relationship in its text and a node in the document structure graph containing the other of the two words in its text on the basis of the inter-word relationship information, and
the knowledge addition unit extracts nouns in the text contained in the nodes at the both ends of the subgraph extracted from the document structure graph in accordance with the rule, and adds information that the nouns obtained from the both nodes have the relationship to the inter-word relationship information.