14. The machine translation apparatus of claim 13 , wherein the processor is further configured to convert the source sentence to language-independent information having a similarity to the language-independent information corresponding to the target sentence higher than a preset threshold.
13. A machine translation apparatus comprising: a nonvolatile and volatile memory storing information to implement an encoder for a first language and a decoder for a second language different from the first language; and a processor configured to communicate with the nonvolatile and volatile memory via a bus, implement the encoder for the first language and the decoder for the second language based on the information stored in the memory, and translate a source sentence written in the first language into a target sentence written in the second language using the encoder for the first language and the decoder for the second language; wherein the processor is further configured to convert the source sentence to language-independent information using the encoder for the first language, and convert the language-independent information to the target sentence using the decoder for the second language, in response to a similarity being higher than a preset threshold, wherein the similarity is determined from a comparison between pixel values of the language-independent information of the source sentence and pixel values of the language-independent information of the target sentence; and the encoder for the first language is trained, using the processor, to output language-independent information corresponding to the target sentence in response to an input of the source sentence.