An image processing apparatus includes a discrimination unit configured to sequentially perform discrimination of whether each of a plurality of image data includes a predetermined object using a parameter stored in a storage unit, an update unit configured to update the parameter stored in the storage unit, and a control unit configured to, when the discrimination unit discriminates that the predetermined object is included, control the update unit to update the parameter and the discrimination unit to perform the discrimination on current image data using the updated parameter, and when the discrimination unit discriminates that the predetermined object is not included, control the update unit to maintain the parameter stored in the storage unit and the discrimination unit to perform the discrimination on next image data using the maintained parameter. By using this image processing apparatus, the processing can be speeded up without increasing a size of a circuit.