3. The device according to claim 1 , further comprising: an input unit which inputs selected one of a character and a character string; and a generating unit which generates a plurality of related words analogous in reading to selected one of the character and the character string with reference to a synonym dictionary which stores a plurality of synonyms for the related words, wherein the first display unit displays the related words analogous in reading to selected one of the character and the character string.
3. The device according to claim 1 , further comprising: an input unit which inputs selected one of a character and a character string; and a generating unit which generates a plurality of related words analogous in reading to selected one of the character and the character string with reference to a synonym dictionary which stores a plurality of synonyms for the related words, wherein the first display unit displays the related words analogous in reading to selected one of the character and the character string. 4. The device according to claim 3 , wherein the generating unit generates the plurality of related words in such a manner that the number of related words is increased for a length of the character string not more than a predetermined number, and the number of related words is reduced for the length of the character string exceeding the predetermined number.