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 . <EOS>