3. The system according to claim 2 , wherein the memory further storing instructions that upon execution by the processor cause the system to: query the search tree storage unit according to the guiding Chinese character(s) to acquire the address information of the guiding recommended word(s) with the guiding Chinese character(s) as a prefix; query the recommended word database according to the address information of the guiding recommended word(s) to acquire corresponding recommended word(s) and then suggest the recommended word(s) to the user.
2. The system according to claim 1 , wherein the recommended word database also stores Pinyin corresponding to the recommended word(s); and wherein the memory further storing instructions that upon execution by the processor cause the system to: query the recommended word database according to the input Pinyin to acquire guiding Chinese character(s) corresponding to the input Pinyin and use the guiding Chinese character(s) as a search keyword; or use directly the input Chinese character as a search keyword.