An air conditioner which is controlled to operate by executing an artificial intelligence (AI) algorithm and/or a machine learning algorithm in a 5G environment connected for the Internet of Things and an operating method of an air conditioner are provided. The air conditioner includes a communicator, a command input, an operation manipulator, and a controller. The communicator collects weather information and operation information of at least one connected devices. The command input receives a manipulation command of a user. An operation manipulator adjusts at least one of whether to operate the air conditioner for cooling/heating, a temperature, a wind volume, or a wind direction of the air conditioner. The controller derives a first customized value based on a manipulation command input by the command input and information collected by the communicator and controls the operation manipulator in accordance with the first customized value.