SOUND CONTROL DEVICE, STORAGE MEDIUM STORING COMPUTER PROGRAM FOR SOUND CONTROL, AND SOUND CONTROL METHOD

A sound control device has a processor configured to determine whether a driving mode of a vehicle is a first driving mode wherein degree to which the driver participates in driving is low or a second driving mode wherein the degree to which the driver participates in driving is higher, and decide to cause attenuation of predetermined sounds inside the vehicle in a first attenuation mode, using a sound control unit which generates a suppression sound signal for output of suppression sound to cause attenuation of the predetermined sounds, when the driving mode of the vehicle is the first driving mode, or decide to cause attenuation of the predetermined sound inside the vehicle in a second attenuation mode which has a smaller degree of attenuation than the first attenuation mode, when the driving mode of the vehicle is the second driving mode.