An air conditioner comprising: a water tank to store water; a humidification medium; a watering housing for drawing water stored in the water tank and spraying the water to supply water to the humidification medium; a watering motor to rotate the watering housing; a visual body coupled with the water tank to reflect and scatter water sprayed from the watering housing; a top cover assembly disposed at the upper end of the visual body, the top cover assembly having an outlet through which air is discharged; a blower fan to blow air to the humidification medium; a blower motor to rotate the blower fan; an operation module to receive an instruction from a user and to set a sterilizing dry mode for sterilizing and drying the humidification medium; a sterilization module to sterilize the humidification medium; and a control unit to control the watering motor, the blower motor, and the sterilization module according to an instruction inputted to the operation module, wherein the humidification medium is formed of a material that is capable of containing moisture, wherein the humidification medium is disposed not to directly contact water stored in the water tank, wherein the control unit stops an operation of the watering motor according to an instruction inputted to the operation module, operates the blower motor and the sterilization module when the sterilizing dry mode is set, and stops the operation of the sterilization module after a predetermined sterilizing dry time elapses, wherein when the blower motor is operated, air blown by the blower fan flows into a space formed between the visual body and the water tank, passes the humidification medium, and is discharged through the outlet. a water tank to store water; a humidification medium; a watering housing for drawing water stored in the water tank and spraying the water to supply water to the humidification medium; a watering motor to rotate the watering housing; a visual body coupled with the water tank to reflect and scatter water sprayed from the watering housing; a top cover assembly disposed at the upper end of the visual body, the top cover assembly having an outlet through which air is discharged; a blower fan to blow air to the humidification medium; a blower motor to rotate the blower fan; an operation module to receive an instruction from a user and to set a sterilizing dry mode for sterilizing and drying the humidification medium; a sterilization module to sterilize the humidification medium; and a control unit to control the watering motor, the blower motor, and the sterilization module according to an instruction inputted to the operation module, wherein the humidification medium is formed of a material that is capable of containing moisture, wherein the humidification medium is disposed not to directly contact water stored in the water tank, wherein the control unit stops an operation of the watering motor according to an instruction inputted to the operation module, operates the blower motor and the sterilization module when the sterilizing dry mode is set, and stops the operation of the sterilization module after a predetermined sterilizing dry time elapses, wherein when the blower motor is operated, air blown by the blower fan flows into a space formed between the visual body and the water tank, passes the humidification medium, and is discharged through the outlet.