1. A machine translation system comprising: translation processing means for processing an input original sentence so as to obtain translated-word possibilities and translation data associated therewith corresponding to translation processing units of the original sentence, thereby producing a translated-sentence possibility, formed of selected translation processing units, corresponding to the original sentence, said translation processing means including syntax determining means for determining improper combinations of translated words and producing said translated sentence possibility only in accordance with predetermined grammatical rules; display means for displaying the translated-sentence possibility produced by said translation processing means; division display control means, operated in response to the processing of said translation processing means, for controlling said display means so that the displayed translated-sentence possibility is divided into the translation processing units in said translation processing means and is displayed on said display means; identifying display control means, operated in respose to the processing of said translation processing means, for controlling said display means in such a manner that, if portions of the original sentence have other translation processing units in addition to the displayed translation processing units, the translated-sentence possibility is displayed so that positions of said portions of the original sentence having the other translation processing units and classes of the other translation-processing units are identified; and selection means to enable an operator to select an appropriate translation processing unit while displaying the other translation processing units on said display means.
3. A system according to claim 1, wherein said identifying display control means comprises: means for controlling display so that the other translation processing units are displayed with display attributes which differ in accordance with the classes of the other translated-word possibilities.