1. A text classification apparatus comprising: a text input device for receiving an entered text; a storage device for storing a concept thesaurus file for use in classifying an entered text to be classified, a cross lingual word sense-based knowledge file corresponding to a plurality of languages including a first and a second language, and a word-based classification knowledge file; a processing unit for executing a classification of the entered text to be classified to assign a category to the text; and an output device for outputting the classification result, wherein: said text input device receives an entered text to be classified in the first language, said processing unit is configured to: extract a word from said first text to be classified; convert the extracted a word into a word sense using said concept thesaurus file; compare the word sense resulting from the conversion with information on each category included in said cross lingual word sense-based classification knowledge file to calculate a first score for each category; compare the extracted word with word classification information included in said word-based classification knowledge file to calculate a second score for each category; and integrate said first and second scores for each category to determine a category for the first text to be classified in the first language for assigning a category to the first text, and said word-based classification knowledge file is generated by learning a word-based classification knowledge using words included in a labeled text in the first language.