1. A method for pushing content items, comprising: obtaining a target text and analyzing lexically the target text; extracting features, comprising traffic feature, from the target text; classifying hierarchically, the features extracted from the target text, based on a pre-trained hierarchical classification model considering traffic feature to obtain a hierarchical classification of the target text; selecting one or more among a plurality of content items based on the hierarchical classification of the target text; obtaining the selected content items; and pushing the obtained content items to a terminal.