An air conditioner is provided. The air conditioner includes a display, a storage configured to store power consumption information and time information which are required to increase or decrease an indoor temperature by a unit temperature according to an outdoor temperature, a sensor, and a processor configured to predict, based on a desired temperature being input, at least one of a power consumption or a required time for the indoor temperature to reach the desired temperature by the sensor based on information stored in the storage, and provide at least one of the predicted power consumption or the required time through the display.