Optimized digital operational encoding and input method of world character information and information processing system thereof are directed to digital operational encoding of the world character information with ten numerals 0-9 unifiedly by means of the encoding method operated with addition and subtraction by areas and positions. The method and device takes these number codes as the index codes of retrieving the literatures of world characters and the computer input codes of world characters, so as to build up a complete set of method and systems capable of using world character to design the operating system, computer language, chip instruction, wireless interface protocol, and wireless internet protocol, used widely for computer, communications, network system, and the sorting and retrieving system of world character codes.