The translator of the present invention includes the following units. A unit for analyzing semantic structure of a received source language sentence through a morphological and syntactic analyses, a unit for transforming the semantic structure of the source language sentence into that of the target language by determining target language words equivalent to individual words composing the source language sentence while, in case of need, supplementing a word to conform to the grammar of the target language, and a unit for generating a target language sentence by rearranging the determined words in conformance with the semantic structure of the target language. The translator further includes a unit for holding various display modes applied to a word supplemented in order to display it distinguishable from the other words composing the target language sentence.