1. A method for filtering a candidate document in a candidate document set, wherein the candidate document set comprises at least one candidate document, the method comprising: receiving one or more entity word—topic word pairs; identifying one or more entity words of the candidate document by a processor, wherein the one or more entity words are words indicating focused entities of the candidate document; identifying, based on each identified entity word, one or more topic words related to based entity words in the candidate document where the identified entity word is located; determining, by the processor, whether to add the candidate document into a filtered document set using the entity words and topic words in the given entity word—topic word pairs and the identified entity words and topic words in the candidate document; and adding the candidate document into the filtered document set in response to determining that the candidate document should be added into the filtered document set, wherein: each of the entity word—topic word pairs comprise an entity word and a topic word; all entity words in the entity word—topic word pair form an entity word set; and all topic words in the entity word—topic word pair where each entity word is located form a topic word set corresponding to the entity word.
1. A method for filtering a candidate document in a candidate document set, wherein the candidate document set comprises at least one candidate document, the method comprising: receiving one or more entity word—topic word pairs; identifying one or more entity words of the candidate document by a processor, wherein the one or more entity words are words indicating focused entities of the candidate document; identifying, based on each identified entity word, one or more topic words related to based entity words in the candidate document where the identified entity word is located; determining, by the processor, whether to add the candidate document into a filtered document set using the entity words and topic words in the given entity word—topic word pairs and the identified entity words and topic words in the candidate document; and adding the candidate document into the filtered document set in response to determining that the candidate document should be added into the filtered document set, wherein: each of the entity word—topic word pairs comprise an entity word and a topic word; all entity words in the entity word—topic word pair form an entity word set; and all topic words in the entity word—topic word pair where each entity word is located form a topic word set corresponding to the entity word. 6. The method according to claim 1 , wherein determining whether to add the candidate document into the filtered document set using the entity words and topic words in the entity word—topic word pairs and the identified entity words and topic words in the candidate document further comprises: determining to add the candidate document into the filtered document set, in response to a determination that an entity word of the candidate document is identical to a certain entity word in the entity word set of the entity word—topic word pairs while a topic word identified in the candidate document based on an entity word in the candidate document is identical to a certain topic word in the topic word set corresponding to a certain entity word in the entity word set.