Patent ID: 8244732

Claim:
A named entity marking apparatus, comprising: a storage unit, being configured to store an electronic document and a named entity database, the named entity database comprising a plurality of named entities, each of the named entities corresponding to a piece of information, each of the named entities corresponding to at least one category; and a processor, being electrically connected to the storage unit and configured to: mark the electronic document into a first marked document according to a first set of the named entity database so that the first marked document has a plurality of marked named entities, each of the marked named entities being one of the named entities comprised in the first set; determine at least one first selected category according to the categories corresponding to the marked named entities; define a second set of the named entity database according to the at least one first selected category; re-mark the electronic document into a second marked document according to the second set, the second marked document having a plurality of marked named entities, each of the marked named entities of the second marked document being one of the named entities comprised in the second set; and determine a third set of the named entity database according to the pieces of information corresponding to the marked named entities of the second marked document and mark the second marked document into a third marked document according to the third set, wherein the processor determines that the pieces of information corresponding to the marked named entities of the second marked document comprise at least one unmarked named entity in the second marked document, and when the at least one unmarked named entity is not incorporated in the second set but corresponds to a second selected category, the processor determines that the third set comprises the named entities corresponding to the second selected category.