CONVERSATION PROTECTION SYSTEM AND CONVERSATION PROTECTION METHOD

PROBLEM TO BE SOLVED: To prevent that the content of conversation is caught by a third party by reproducing sound, and to reduce discomfort of the third party to the reproduced sound.SOLUTION: A conversation protection system is constituted of: a microphone for collecting voice for performing conversation; a storage part which stores attention sound effect data showing time axis waveform which attenuates after a sound pressure level starts in several seconds and base sound effect data showing time axis waveform whose sound pressure level gradually changes in comparison with an attention sound effect; a speaker for reproducing the attention sound effect and the base sound effect toward a third party except a party concerned; and a control part which reproduces the base sound effect while at least the sound pressure level of conversation voice collected by the microphone exceeds a first threshold, and reproduces the attention sound effect whenever the sound pressure level of the conversation voice exceeds a second threshold.