PURPOSE: To decide the type of a user from the voice and change an answer message matching the type of the user.

CONSTITUTION: This voice input/output device is provided with a frequency analysis device 2 which decides the sex of the user, a voice recognition device 3 which decides how much the user is in a hurry, an answer time measuring instrument 4 which decides how much the user is familiar with operation, a total decision device 5 which judges the type of the user by comparing data indicating the tendency of past users stored in a reference data memory 6 with the decision result data, and a voice synthesizer 8 which composes an answer message corresponding to the specified type of the user by using voice data stored in a voice data memory 7 and outputs the message.