1. A method for retrieving keyword from speech, comprising: configuring, by an apparatus comprising a processor circuitry, language models, wherein at least two of the language models each comprises a recognition model and a decoding model that corresponds to the recognition model; extracting a speech feature, by the apparatus, from to-be-processed speech data; determining, by the apparatus, which of the recognition models has a highest language matching rate by performing, using the recognition models, language matching on the extracted speech feature; identifying, by the apparatus, the decoding model which corresponds to the determined recognition model; decoding, by the apparatus, the extracted speech feature by using the identified decoding model, and obtaining a word recognition result; and matching, by the apparatus, a keyword in a keyword dictionary and the word recognition result with each other, and outputting a matched keyword on a display of the apparatus.