An image processing apparatus that records image data on a detachable storage medium in a previously set recording format is provided. The apparatus sets the recording format of image data, and determines whether or not a storage medium attached to an attachment unit has a communication function that communicates with a different apparatus than the image processing apparatus. If it is determined that the storage medium has a communication function, and that the recording format of image data that can be transferred by the communication function does not match the recording format that has been set, the apparatus issues a warning.