The present disclosure provides a technology that can preferably improve the usability when a user wearing a hearable device boards a vehicle. In an information processing device according to the present disclosure, a controller obtains a drive mode of a vehicle in which a user wearing the hearable device rides. When the drive mode of the vehicle is an automatic drive mode, the controller permits the operation mode of the hearable device to be set to a first mode. On the other hand, when the drive mode of the vehicle is a manual drive mode and a user wearing a hearable device is a user performing a drive operation of the vehicle, the controller sets the operation mode of the hearable device to a second mode.