7. The apparatus of claim 5 , wherein the new emotion expression lexeme determination unit groups the derived emotion expression lexemes for each emotion basis lexeme having the same meaning, thereby generating emotion expression lexeme groups, ranks the emotion expression lexeme groups according to at least one predefined lexeme criterion, extracts emotion expression lexemes from emotion expression lexeme groups above a certain rank, and stores the extracted emotion expression lexemes as the new emotion expression lexemes in the database in correspondence with the new emotion basis lexeme.
5. An apparatus for building information on an emotion lexeme comprising: a database including emotion expression lexemes and emotion basis lexemes corresponding to the emotion expression lexemes; an emotion basis lexeme derivation unit retrieving documents on the web on a basis of an original emotion expression lexeme from a sentence which is input, and deriving emotion basis lexemes of the original emotion expression lexeme from sentences of the documents including the original emotion expression lexeme; a new emotion basis lexeme determination unit storing a new emotion basis lexeme determined among the emotion basis lexemes according to a predefined new lexeme criterion, in the database; an emotion expression lexeme derivation unit retrieving a document on the web on a basis of the new emotion basis lexeme and deriving emotion expression lexemes related to the emotion basis lexeme from sentences of the document including the new emotion basis lexeme; and a new emotion expression lexeme determination unit storing a new emotion expression lexeme determined among the emotion expression lexemes according to a predefined new lexeme criterion, in the database, wherein the new emotion expression lexeme determination unit assigns an emotion strength to the new emotion expression lexeme and then stores the emotion strength of the new emotion expression lexeme in the database, and wherein the emotion strength is calculated by multiplying an emotion strength value of the new emotion expression lexeme by a sum of weights of a plurality of modifiers.