PURPOSE: To obtain high conversion efficiency without increasing the capacity of a storage medium excessively, by storing basic information and additional information in different media, combining those pieces of information together in a device, and performing the conversion on the basis of the combined dictionary information.

CONSTITUTION: A KANA (Japanese syllabary)-KANJI (Chinese character) converting mechanism 6 generates a KANA character string on the basis of KANA codes inputted on a keyboard 8 and actuates a reading mechanism 3. The mechanism 3 reads basic information characteristic to a term corresponding to the specified character string out of a disk 2, and then reads additional information corresponding to the basic information out of a floppy disk 1. Those additional information and basic information are written in buffers 9 and 10 respectively. A dictionary information combining mechanism 4 reads those pieces of information out of the buffers 9 and 10 and combines and writes them in a buffer 11. The mechanism 6 reads the contents of the buffer 11 to find corresponding terms and the terms with the highest frequency of use is specified as the 1st candidate. Thus, the term converted as mentioned above is written in a buffer 7 and stored as a character string after KANA-KANJI conversion.