A ventilation apparatus having a humidity adjusting and sterilizing device, and a method for controlling the same method are disclosed. A humidity adjusting and sterilizing device includes a channel (110) allowing air to flow therein； a housing (150) having a side in communication with the channel, the housing having the other sides closed； a tub (160) mounted within the housing for holding water therein； and a microwave generator (172) for humidifying the air within the channel and for sterilizing bacteria contained in the air of the channel by radiating the microwaves discharged into the channel. The humidity adjusting and sterilizing device includes a housing having a side in communication with the inlet channel, the housing having the other sides closed； a tub mounted within the housing for holding water therein； and a microwave generator for radiating microwaves into the housing and the tub and.
