17. An apparatus for updating a dictionary comprising: a document extraction unit to access a server through a network and extract a document of interest of a user in each predetermined extraction period; an unregistered word extraction unit to extract candidate unregistered words existing in the extracted document according to predetermined unregistered word extraction rules, and based on appearance frequency information of the candidate unregistered words in the document, to extract unregistered words among the candidate unregistered words; an unregistered word verification unit to verify the unregistered words with usage examples of the unregistered words extracted through the server, and to determine semantic classes of the verified unregistered words; a first memory unit to store registered words by registering all of the verified unregistered words and the semantic classes of the unregistered words; and a second memory unit to store registered words by re-registering registered words, among registered words registered in the first memory unit, based on the user's usage frequency of the registered words and appearance frequency information in a document of the registered words, wherein registered words registered in the second memory unit are retrieved prior to registered words registered in only the first memory unit.
17. An apparatus for updating a dictionary comprising: a document extraction unit to access a server through a network and extract a document of interest of a user in each predetermined extraction period; an unregistered word extraction unit to extract candidate unregistered words existing in the extracted document according to predetermined unregistered word extraction rules, and based on appearance frequency information of the candidate unregistered words in the document, to extract unregistered words among the candidate unregistered words; an unregistered word verification unit to verify the unregistered words with usage examples of the unregistered words extracted through the server, and to determine semantic classes of the verified unregistered words; a first memory unit to store registered words by registering all of the verified unregistered words and the semantic classes of the unregistered words; and a second memory unit to store registered words by re-registering registered words, among registered words registered in the first memory unit, based on the user's usage frequency of the registered words and appearance frequency information in a document of the registered words, wherein registered words registered in the second memory unit are retrieved prior to registered words registered in only the first memory unit. 28. The apparatus of claim 17 , wherein a candidate unregistered word is an individual name formed with a word or a set of words not registered in the dictionary.