An air conditioner system comprising: a central controller configured to obtain building entry information of a user associated with a predetermined space inside a building; and an indoor unit disposed in the predetermined space and configured to transmit whether the user is in the predetermined space to the central controller, wherein the central controller controls the indoor unit so that the indoor unit is operated in an operation mode corresponding to whether the user enters the building and whether the user is in the predetermined space, characterized in that: when the user is in the building and in the predetermined space, the indoor unit is operated in a first mode in which a set value is predetermined for a predetermined number of setting items among setting items set in relation to the indoor unit, the indoor unit is operated in a second mode that consumes less energy than the first mode when the user is in the building and is not in the predetermined space, the indoor unit is operated in a third mode in which energy consumption is minimal among a plurality of operation modes when the user is not in the building, and the indoor unit determines whether the user is in a room through a provided camera or sensor or determines whether the user is in the room based on sensing information received from an exterior presence detection sensor. a central controller configured to obtain building entry information of a user associated with a predetermined space inside a building; and an indoor unit disposed in the predetermined space and configured to transmit whether the user is in the predetermined space to the central controller, wherein the central controller controls the indoor unit so that the indoor unit is operated in an operation mode corresponding to whether the user enters the building and whether the user is in the predetermined space, characterized in that: when the user is in the building and in the predetermined space, the indoor unit is operated in a first mode in which a set value is predetermined for a predetermined number of setting items among setting items set in relation to the indoor unit, the indoor unit is operated in a second mode that consumes less energy than the first mode when the user is in the building and is not in the predetermined space, the indoor unit is operated in a third mode in which energy consumption is minimal among a plurality of operation modes when the user is not in the building, and the indoor unit determines whether the user is in a room through a provided camera or sensor or determines whether the user is in the room based on sensing information received from an exterior presence detection sensor. when the user is in the building and in the predetermined space, the indoor unit is operated in a first mode in which a set value is predetermined for a predetermined number of setting items among setting items set in relation to the indoor unit, the indoor unit is operated in a second mode that consumes less energy than the first mode when the user is in the building and is not in the predetermined space, the indoor unit is operated in a third mode in which energy consumption is minimal among a plurality of operation modes when the user is not in the building, and the indoor unit determines whether the user is in a room through a provided camera or sensor or determines whether the user is in the room based on sensing information received from an exterior presence detection sensor.