1. A video search method, comprising: receiving meta-data of a query clip, wherein the meta-data comprises a first index tag and a first semantic pattern; retrieving one or more candidate clips from at least one video database according to the first index tag; and comparing the first semantic pattern with a semantic pattern of each of the candidate clips, and marking each of the candidate clips as a returnable video clip or a non-returnable video clip according to a comparison result, wherein the candidate clips marked as the returnable video clip are served as a query result matching the query clip.