To provide a voice processing device suitable for properly paying back voice in accordance with environments, even when there is a sudden change in user's listening environments, a voice processing method, and to provide a program.

In a portable game machine, if user operation is not detected for a prescribed time period or a longer period when voice is output from a headphone, a control part 205 predicts that the user cannot operate the portable game machine in a public place, and controls a playback part 202 so that it plays back voice data in accordance with a prescribed order and the user is not bored. Meanwhile, if user operation is not detected for a prescribed time period or a longer period when voice is output from a speaker, the control part 205 predicts that the user cannot operate the portable game machine in a private place, and controls the playback part 202 so that it plays back the voice data by lowering the volume of the voice data being currently played back, in consideration of privacy.

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