An air-conditioning system comprising: a plurality of indoor unit parts having wireless communication units configured to transmit wireless radio waves; and a mobile terminal unit configured to perform a wireless communication with each of the wireless communication units, the mobile terminal unit including an air-conditioning apparatus operation input unit configured to accept input from a user, an air-conditioning apparatus information display unit configured to display information to the user, and an air-conditioning apparatus operation management unit configured to control the plurality of indoor unit parts, the air-conditioning apparatus operation management unit being configured to cause the air-conditioning apparatus information display unit to display a list of the plurality of indoor unit parts and being configured to cause the air-conditioning apparatus information display unit also to perform display for urging selection of ones of the plurality of indoor unit parts as targets of a collective setting operation, when ones of the plurality of indoor unit parts are selected from the air-conditioning apparatus operation input unit, the air-conditioning apparatus operation management unit being configured to set the selected ones of the plurality of indoor unit parts as a group, wherein, when the air-conditioning apparatus operation management unit accepts input of the collective setting operation and selection of the group from the air-conditioning apparatus operation input unit, the air-conditioning apparatus operation management unit is configured to transmit an air-conditioning operation command to all the wireless communication units of ones of the plurality of indoor unit parts registered in the selected group, wherein the air-conditioning apparatus operation management unit has information related to a user ID, and wherein, when the air-conditioning apparatus operation management unit accepts input of a user ID of an administrator from the air-conditioning apparatus operation input unit with reference to the information related to the user ID, the air-conditioning apparatus operation management unit is configured to cause the air-conditioning apparatus information display unit to display the list of the plurality of indoor unit parts and is configured to cause the air-conditioning apparatus information display unit also to perform the display for urging the selection of ones of the plurality of indoor unit parts as the targets of the collective setting operation. a plurality of indoor unit parts having wireless communication units configured to transmit wireless radio waves; and a mobile terminal unit configured to perform a wireless communication with each of the wireless communication units, the mobile terminal unit including an air-conditioning apparatus operation input unit configured to accept input from a user, an air-conditioning apparatus information display unit configured to display information to the user, and an air-conditioning apparatus operation management unit configured to control the plurality of indoor unit parts, the air-conditioning apparatus operation management unit being configured to cause the air-conditioning apparatus information display unit to display a list of the plurality of indoor unit parts and being configured to cause the air-conditioning apparatus information display unit also to perform display for urging selection of ones of the plurality of indoor unit parts as targets of a collective setting operation, when ones of the plurality of indoor unit parts are selected from the air-conditioning apparatus operation input unit, the air-conditioning apparatus operation management unit being configured to set the selected ones of the plurality of indoor unit parts as a group, wherein, when the air-conditioning apparatus operation management unit accepts input of the collective setting operation and selection of the group from the air-conditioning apparatus operation input unit, the air-conditioning apparatus operation management unit is configured to transmit an air-conditioning operation command to all the wireless communication units of ones of the plurality of indoor unit parts registered in the selected group, wherein the air-conditioning apparatus operation management unit has information related to a user ID, and wherein, when the air-conditioning apparatus operation management unit accepts input of a user ID of an administrator from the air-conditioning apparatus operation input unit with reference to the information related to the user ID, the air-conditioning apparatus operation management unit is configured to cause the air-conditioning apparatus information display unit to display the list of the plurality of indoor unit parts and is configured to cause the air-conditioning apparatus information display unit also to perform the display for urging the selection of ones of the plurality of indoor unit parts as the targets of the collective setting operation.