1. A method of iris scanning and proximity sensing in a terminal, the method comprising: receiving selection information of an operation mode for iris scanning or proximity sensing at an input unit; when the selected operation mode is an iris scanning mode, sensing an iris including emitting light having an amount of light of a first level, and photographing the iris using the emitted light; when the selected operation mode is a proximity sensing mode, sensing a proximity of a terminal including emitting light having an amount of light of a second level, and sensing information on whether an object has approached the terminal using the emitted light; and recognizing the iris by a controller using the photographed iris image, and performing a function according to the sensed information on whether the object has approached the terminal, wherein the first level has a light amount value higher than the light amount value of the second level.