18. The computer-executable program product according to claim 17 , wherein the character string is a character string including single-byte characters, or a character string including multibyte characters comprising at least one of Chinese, Japanese, Korean, and Arabic characters.
17. The computer-executable program product according to claim 16 , wherein the computer program code configured to issue the search command further comprises: computer program code, which is stored in at least one non-transitory storage medium, configured to receive a search string including a plurality of search words to generate a plurality of kinds of search tokens from the plurality of search words; and computer program code, which is stored in at least one non-transitory storage medium, configured to generate a search command to execute inquiries inclusive of a plurality of the parallel inquiries corresponding to the search string.