PURPOSE: To eliminate editing jobs such as insertion and deletion and the unnecessary selecting job of homonyms, and to lighten the burden of the operator by selecting declensional Kana (Japanese syllabary) ending and storing the Kana ending selected and adopted in a dicitionary.

CONSTITUTION: The inputted utterance is tentatively stored in a voice register 3, and the representation with declensional Kana ending information having an index coincident with the pronunciation in the register 3 is all read out from a dictionary storage device 5 and displayed on a display 13. The operator keys in a homonym selection key 101 and selects a desired representation. When the representation displayed on the display 13 is different from the desired representation by the declensional Kana ending, the operator keys in a declensional Kana selection key 102. A declensional Kana information converter 15 reads the content of an information register 9, changes one of selectable declensional Kana endings and displays it.