A method, for outputting information related to a second home appliance. The method includes: obtaining group information for grouping the first home appliance and the second home appliance by assigning the first home appliance as an assistant device and assigning the second home appliance as an actually used device; activating a group mode for operating the first home appliance as an assistant device of the second home appliance, based on the group information; controlling a communication interface to receive information related to operations of the second home appliance from the second home appliance assigned as the actually used device, through a communication channel established based on communication connection information of the second home appliance, the communication channel to connect to the second home appliance; and outputting the information related to the operations of the second home appliance through a first user interface, while the group mode is activated.