Disclosed herein is an apparatus for detecting an obstacle for an around view monitoring system including a processor configured to store a plurality of images captured through an imaging device, convert a view of the images, generate a plurality of view conversion images corresponding to the images, compare the view conversion images corresponding to a plurality of images captured at a different time interval, extract a plurality of overlapping areas between the view conversion images, calculate a degree of mismatch of the overlapping areas between the view conversion images, detect a mismatch area in the overlapping areas, classify the mismatch area as an obstacle area, and display a position of the obstacle through a display of a vehicle.