1. One or more computer-readable media storing computer-executable instructions that, when executed by one or more processors, cause the one or more processors to perform acts comprising: receiving product information associated with a product; conducting word segmentation on the product information to generate a phrase that includes one or more word segments; finding relevancies between the phrase and respective product categories corresponding to multiple nodes having a parent node in a product category tree, finding the relevancies being based at least in part on respective numbers of times that the phrase is contained in product titles associated with the respective product categories corresponding to the multiple nodes and respective numbers of products included in the respective product categories corresponding to the multiple nodes; and selecting a node from the multiple nodes based on the relevancies.