Abstract: A machine translation apparatus in which the sentence construction of a source language entered by an input device is analyzed in order to generate the corresponding translated text after being converted into a sentence construction in a target language, wherein the machine translation apparatus uses a device for determining whether or not a word string obtained from a sentence construction analysis is a proper noun with an acronym, a device for examining whether or not the number of first letters of each of a certain number of words corresponds to the number of letters of the acronym, and also for examining whether or nor these words are registered in a dictionary, and a device for outputting the corresponding term after it is translated into a target language, when the words are registered in the dictionary, and for outputting directly the words, whose number of first letters corresponds to the number of the letters of the acronym, without translating them, when the words are not registered in the dictionar