18. The system according to claim 14 , wherein: the morphological analysis unit when executed acquires word class information corresponding to the respective tokens of the token sequence data; and the token-sequence comparing unit when executed does not extract the token sequence of the token sequence data in cases where the token sequence of the token sequence data and the word class information corresponding to the tokens of the token sequence match the token sequence registered in a token-sequence list and the word class information corresponding to the tokens of the token sequence, respectively.
14. A system for creating a terms dictionary with named entities or terminologies included in text data, the system comprising: a computer system with a processing unit and further comprising: a morphological analysis unit for acquiring token sequence data by performing morphological analysis for the text data; a category distinguishing unit for distinguishing tokens of the token sequence data by using a category dictionary to extract uncategorized words; an uncategorized-word comparing unit for comparing each of the extracted uncategorized words with an uncategorized-word comparison rule to extract an uncategorized word matching the uncategorized-word comparison rule as a registration candidate word, wherein the uncategorized-word comparison rule includes a token composed of a first character string and a first regular expression for use in extracting the matching uncategorized word; a token-sequence comparing unit for comparing a token sequence of the token sequence data with a token-sequence comparison rule to extract a token sequence matching the token-sequence comparison rule as registration candidate words, wherein the token-sequence comparison rule includes a token sequence including a second character string and a second regular expression for use in extracting the matching token sequence; and a permission unit for permitting a user to select whether to register the registration candidate words in the category dictionary.