13. A computer system for detecting inferences from documents, the computer system comprising: a processor; a memory; a receiving mechanism configured to receive one or more documents; a first knowledge extraction mechanism configured to extract a first set of knowledge relevant to the documents; a query formulation mechanism configured to formulate one or more queries to one or more reference corpora based on the first set of knowledge; a second knowledge extraction mechanism configured to extract a second set of knowledge from results received in response to the queries; and a detecting mechanism configured to detect an inference by producing a mapping mechanism configured to produce a mapping relationship between at least one document and a piece of the second set of knowledge which is not within the first set of knowledge, wherein the mapping relationship indicates an inference from the documents.
13. A computer system for detecting inferences from documents, the computer system comprising: a processor; a memory; a receiving mechanism configured to receive one or more documents; a first knowledge extraction mechanism configured to extract a first set of knowledge relevant to the documents; a query formulation mechanism configured to formulate one or more queries to one or more reference corpora based on the first set of knowledge; a second knowledge extraction mechanism configured to extract a second set of knowledge from results received in response to the queries; and a detecting mechanism configured to detect an inference by producing a mapping mechanism configured to produce a mapping relationship between at least one document and a piece of the second set of knowledge which is not within the first set of knowledge, wherein the mapping relationship indicates an inference from the documents. 21. The computer system of claim 13 , wherein while producing the mapping relationship, the mapping mechanism is configured to present one or more words or phrases from the documents, which words or phrases correspond to the first set of knowledge, and one or more sensitive words or phrases extracted from the query results.