To suppress the deterioration of quality of an image and to perform transfer processing for a short time when an image file is transferred to an external apparatus.

An image processing apparatus 6 which saves a photographing image as the image file and transfers this image file to the external apparatus 4 includes parameter determination means for determining a transfer compression parameter based on the image file and a data size which can receive by the external apparatus, and transfer compression means for performing compression processing to the image file and forming a compression image file for the transfer based on the transfer compression parameter determined by the parameter determination means.