Prompt method and prompt device for communication address of indoor unit, and indoor unit

The invention discloses a prompt method for a communication address of an indoor unit. The method comprises the following steps: obtaining an interval the communication address of a present indoor unit belongs to; according to the interval the communication address of the present indoor unit belongs to, determining the number of sound of a buzzer; according to the communication address of the present indoor unit and the interval the communication address of the present indoor unit belongs to, determining a display rule; and according to the number of sound, controlling the buzzer, and according to the display rule, controlling a LED group to display. The prompt method for a communication address of an indoor unit can clearly and completely show the communication address of each indoor unit in a multiple machine, so as to distinguish every indoor unit, and provide convenience for installation and maintenance of the indoor units. The invention also discloses a prompt device for the communication address of an indoor unit, and an indoor unit with the prompt device.