26. A text search system set forth in claim 25, characterized in that said filtering means further includes delimiter code output means, wherein every time an input character code is fetched on a one-by-one character basis sequentially from the text read out from said character string storage means, said delimiter code output means outputs a particular delimiter code to said character string matching means only when the flag correspond to the character codes of n characters fetched till then inclusive of said input character code is "OFF" and when the flag corresponding to n character codes fetched up to a time point when an input character code immediately preceding to the first mentioned input character code is fetched, inclusive of the second mentioned input character code, is "ON".
25. A text search system set forth in claim 23, characterized in that said filtering means includes delimiter output means for fetching n concatenate character codes sequentially from the text read out from said character string storage means to thereby output said n concatenate character codes to said character string matching means only when said n concatenate character codes are included in the designated search terms, while outputting a particular delimiter code to said character string matching means when said n concatenate character codes are not included in the designated search terms and when n concatenate characters inputted immediately before are included in said search terms.