PURPOSE: To reduce memory capacity to be used in a KANA (Japanese syllabary)/ KANJI (Chinese character) conversion dictionary by utilizing the learning file matching with a conversion object field, performing a proper KANA/KANJI conversion and improving a conversion efficiency.

CONSTITUTION: This device is composed of a learning file group 3 composed of plural learning files, a KANA/KANJI conversion dictionary 4, an input means 1 performing the inputs of the designation information of the learning files and characters, a display device 2 displaying the designation information of the learning files and KANA/KANJI conversion results, a learning file designation means 5 retrieving the learning file group 3 based on the designation information of the learning files and determining the learning files and the KANA/KANJI conversion dictionary 4, a KANA/KANJI conversion means 6 retrieving the KANA/KANJI dictionary 4 corresponding to the determined learning file and performing the KANA/KANJI conversion, and an integration means 7 starting the learning file designation means 5, determining the learning files and the KANA/KANJI conversion dictionary 4, performing the KANA/KANJI conversion processing by starting the KANA/KANJI conversion means 6 and displaying KANA/KANJI conversion results by starting the display means 2.