13. The method as recited in claim 9 , 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 selecting the one or more recommended categories for each of the multiple words in a product title, the multiple words in the product title including none of the one or more stop words.
9. A method comprising: obtaining one or more recommended categories for each of multiple words in a product title; combining the one or more recommended categories for each of the multiple words to obtain a plurality of recommended categories for the product title; using a word frequency of a respective word in the multiple words under each of the plurality of recommended categories for the product title as a weight of the respective word under a respective recommended category for the product title; calculating a sum of weights of the multiple words for each of the plurality of recommended categories for the product title; and choosing one or more recommended categories for the product title based on a result of calculating the sum of weights of the multiple words for each of the plurality of recommended categories.