5. An electronic device, comprising: one or more processors; a storage; and one or more computer programs stored on the storage and configured to cause the one or more processors to perform a multimedia information retrieval method, wherein the one or more computer programs comprise: a voice extracting module configured to extract a voice of multimedia to be retrieved from multimedia to be retrieved; a voice recognizing module configured to recognize the voice of the multimedia to be retrieved to obtain a recognized text; and a retrieving module configured to retrieve multimedia information of the multimedia to be retrieved in a multimedia database according to the recognized text, wherein the retrieving module further comprises: an undetermined recognition code determining unit configured to perform word segmentation on the recognized text according to a preset word library to obtain a plurality of undetermined recognition codes; a recognition code determining unit configured to determine a plurality of recognition codes according to word occurrence frequencies of the undetermined recognition codes in the word library; and a retrieving unit configured to retrieve the recognition codes in the multimedia database to obtain the multimedia information of the multimedia to be retrieved.
7. The electronic device according to claim 5 , wherein, the recognition code determining unit is configured to: select n undetermined recognition codes with the lowest word occurrence frequencies in the word library from the plurality of undetermined recognition codes; randomly select m undetermined recognition codes, so that each one of the n undetermined recognition codes is different from any one of the m undetermined recognition codes; and set the n undetermined recognition codes and the m undetermined recognition codes as the plurality of recognition codes, wherein n is equal to or larger than 1, and m is equal to or larger than 0.