Control device, control method, and program

A control method performed by a control device comprising:

• a first step of performing first control processing of changing a first acoustic signal such that a user is able to easily listen to a second acoustic signal in response to the second acoustic signal that is different from the first acoustic signal or a notification related to the second acoustic signal in a case where the user who is listening to the first acoustic signal is not in a concentration state or in a case where a degree of concentration of the user is lower than a first reference;
• and
• a second step of performing second control processing of not performing the first control processing in a case where the user is in the concentration state or in a case where the degree of concentration is equal to or greater than the first reference.