4. The method as recited in claim 3 , wherein the determining the one or more stop words from the product title comprises presetting a table of stop words.
3. The method as recited in claim 1 , further comprising: determining one or more stop words from the product title; and filtering the one or more stop words from the product title prior to obtaining the word frequency of the one or more words in the product title under the first category and another word frequency of the one or more words in the product title under the second category, the one or more words in the product title including none of the one or more stop words.