The method includes following procedures: using technique of network crawler to obtain web pages of Internet; carrying out procedure of dividing words for information of web pages; carrying out statistics of word frequency for vocabulary entry, and saving statistical result so as to form Internet word frequency base. Using public real-time changeable information from Internet being as source of statistics of word frequency, the invention can create up to date, optimal information of word frequency. Through each convenient way, the method updates the word frequency base of system in input method system from the said optimal information of word frequency. Thus, information of word frequency base of system can be kept consistent to information in Internet. The invention raises hit rate of first selected word from user so as to raise input speed and efficiency.