A robot cleaner is provided that includes a driver configured to move the robot cleaner, and a suction unit configured to suck foreign objects from a surface below the robot cleaner. The robot cleaner also includes a detector configured to capture images of regions disposed in front of the robot cleaner. The robot cleaner further includes a controller configured to control the detector to capture a first image of a region before cleaning, control the detector to capture a second image of the region after cleaning, and generate cleaning result information using the first and second images.