14. A text search system set forth in claim 9, characterized in that said filtering means includes leading concatenate character flag storage means for setting a value indicating "ON" in slots corresponding to concatenate character codes of a leading portion, referred to as leading concatenate character code, of the search term designated previously while setting a value indicating "OFF" in slots corresponding to the other character codes, and trailing concatenate character flag storage means for setting a value indicating "ON" in slots corresponding to other concatenate character codes, referred to as trailing concatenate character codes, than said leading concatenate character codes contained in said search term while setting a value indicating "OFF" in a slot corresponding to the other concatenate character codes; said system further comprising output select means for referencing said leading concatenate character flag storage means and said trailing concatenate character flag storage means in correspondence to n concatenate character codes inputted from said character string storage means sequentially, to thereby output said concatenate character codes to said character string matching means only when the relevant leading concatenate character flag as read out is "ON" while when said leading character flag once assumed "ON", said output select means outputs the input character codes to said character string matching means only when either the relevant leading character flag or trailing character flag is "ON" before both of said leading character flag and said trailing character flag become "OFF".
14. A text search system set forth in claim 9, characterized in that said filtering means includes leading concatenate character flag storage means for setting a value indicating "ON" in slots corresponding to concatenate character codes of a leading portion, referred to as leading concatenate character code, of the search term designated previously while setting a value indicating "OFF" in slots corresponding to the other character codes, and trailing concatenate character flag storage means for setting a value indicating "ON" in slots corresponding to other concatenate character codes, referred to as trailing concatenate character codes, than said leading concatenate character codes contained in said search term while setting a value indicating "OFF" in a slot corresponding to the other concatenate character codes; said system further comprising output select means for referencing said leading concatenate character flag storage means and said trailing concatenate character flag storage means in correspondence to n concatenate character codes inputted from said character string storage means sequentially, to thereby output said concatenate character codes to said character string matching means only when the relevant leading concatenate character flag as read out is "ON" while when said leading character flag once assumed "ON", said output select means outputs the input character codes to said character string matching means only when either the relevant leading character flag or trailing character flag is "ON" before both of said leading character flag and said trailing character flag become "OFF". 15. A text search system set forth in claim 14, characterized in that said output select means further includes delimiter code output means for outputting to said character string matching means a particular delimiter code only when said leading character string flag and said trailing character string flag corresponding to the n input concatenate character codes are "OFF" and when said leading character string flag and said trailing character string flag corresponding to n concatenate character codes immediately preceding to said n input character codes of "OFF" are "ON".