A language learning computer system is proposed which allows students to learn a foreign language as naturally as a baby learns its mother tongue. The computer system has a CPU which is programmed to show a first character as an instructor and a second character as a student on the display, produce a voice sound from the speaker, and move the first character corresponding to the voice sound produced from the speaker. If a student operates the input device corresponding to the movement of the first character, the CPU moves the second character exactly as the first character moves. In stage 2, if the student operates the input device corresponding to the voice sound produced from the speaker, the CPU moves the second character corresponding to the voice sound produced by the speaker. In stage 3, if a voice sound picked up by a microphone coincides with the voice sound produced by the speaker, the CPU moves the second character corresponding to the voice sound produced by the speaker.