An image photographing apparatus and a method for controlling the image photographing apparatus are provided. The method includes outputting light so as to penetrate a projection and fall on an object, receiving first reflective light reflected from an object, obtaining a first image based on information of the first reflective light, controlling the projection using predetermined information to generate a controlled projection, receiving second reflective light using the controlled projection, obtaining a second image based on information of the second reflective light, and generating a depth map using the obtained first image and second image.