PURPOSE: To attain the high-speed and fine control of a processing program by setting a mode where an input operation of a keyboard is reported sequentially to the processing program as an attention having data.

CONSTITUTION: When a key of KATAKANA (square form of Japanese syllabary) 'A' is pushed, this push of the key is informed to a processing program. Thus the processing program displays HIRAGANA (Japanese syllabary) 'A' on a display screen. Then the push of a key of KATAKANA 'I' is informed to the processing program. Thus the processing program displays HIRAGANA 'I' on the display screen. The push of a conversion key is also informed to the processing program. Then the processing program displays KANJI (Chinese character) 'AI' (love in English) to the KANA (Japanese syllabary) 'AI' on the screen. A keyboard contains character keys, various function keys, a scroll-up key, a scroll-down key, etc. The codes produced with push of these keys on the keyboard can be informed to the processing program.