Disclosed is a method and apparatus for determining an abnormal object, the method including selecting a candidate object from target objects extracted from a two-dimensional (2D) image of a front view captured from a host vehicle, generating a three-dimensional (3D) model of the candidate object, determining, based on the 3D model, whether the candidate object corresponds to an abnormal object that interferes with driving of the host vehicle, and outputting the abnormal object, in response to the candidate object corresponding to the abnormal object.