A method for establishing cross-language information is disclosed. The method includes steps of collecting a plurality of set of object information from a plurality of network platforms; building a first data structure corresponding to a source language and a second data structure corresponding to a target language according to the plurality of sets of object information; classifying a plurality of sets of first object information in the first data structure into a plurality of source image groups according characteristics of the plurality of sets of first object information; classifying a plurality of sets of second object information in the second data structure into a plurality of target image groups according to characteristics of the plurality of sets of second object information; wherein each source image group includes a plurality of source hashtag groups, and each target image group includes a plurality of target hashtag groups.