Control method, controller, and device

A method of controlling a device included in a predetermined space, the method comprising:

• receiving, from a processor, a first command for setting a first sound volume in the device as a sound volume upper-limit value;
• and
• setting, by the processor, the first sound volume as the sound volume upper-limit value in the device, wherein
• the first sound volume is determined by the processor based on a database and sleep information of a person present in the predetermined space, the sleep information being obtained from a biological sensor disposed in the predetermined space,
• the sleep information indicates a sleep state of the person,
• the database indicates a correspondence between the sleep state and a target sound volume of a corresponding device, and
• the target sound volume of the corresponding device is a predetermined sound volume which does not awake a sleeping person at the sleep state and still be heard by an awake person.

A controller which controls a device included in a predetermined space, the controller comprising:

• a communicator;
• and
• a processor, wherein
• the communicator obtains sleep information of a person present in the predetermined space from a biological sensor disposed in the predetermined space, the sleep information indicating a sleep state of the person,
• the processor determines a first sound volume of the device based on a database indicating a correspondence between the sleep state and a target sound volume of a corresponding device, the target sound volume of the corresponding device being a predetermined sound volume which does not awake a sleeping person at the sleep state and still be heard by an awake person, and
• the communicator transmits, to the device, a command for setting the first sound volume in the device as a sound volume upper-limit value.

A device installed in a predetermined space, the device comprising:

• a communicator;
• and
• a processor, wherein
• the communicator receives, from a controller connected to the device, a first command for setting a first sound volume in the device as a sound volume upper-limit value,
• the processor sets the first sound volume as the sound volume upper-limit value in the device,
• the first sound volume is determined by the controller based on a database and sleep information of a person present in the predetermined space, the sleep information being obtained from a biological sensor disposed in the predetermined space,
• the sleep information indicates a sleep state of the person,
• the database indicates a correspondence between the sleep state and a target sound volume of a corresponding device, and
• the target sound volume of the corresponding device is a predetermined sound volume which does not awake a sleeping person at the sleep state and still be heard by an awake person.