An antenna apparatus includes a first side metal frame having a first slot and a first feed point, and a bottom metal frame having a second slot and a second feed point. A first ground point is arranged between the bottom metal frame and a second side metal frame of the electronic device. The apparatus also includes a plurality of tuning switches including a first tuning switch connected to the first side metal frame, and a second tuning switch and a third tuning switch connected to the bottom metal frame. The second tuning switch is connected to a first side of the second slot, the third tuning switch is connected to a second side of the second slot, and the first side is closer to the first side metal frame than the second side. A feeder selectively connects to the first feed point or the second feed point.