18. The computer-readable medium of claim 17 , wherein obtaining the alternative text corresponding to the approximate pinyin of the initial text further comprises: according to a descending order of the different approximation grades, successively determining whether the standard pinyin of the initial text matches pinyin in the preset mapping relationship table; and in accordance with a determination that the standard pinyin of the initial text matches pinyin in the preset mapping relationship table, obtaining, as the alternative text, text corresponding to the one or more matching pinyin identified according to the preset mapping relationship table.
17. The computer-readable medium of claim 13 , wherein the preset mapping relationship table includes respective approximate pinyin of different approximation grades corresponding to each word in the word database.