A developing process or editing process is performed with a high response,
for raw image obtained by image sensing by a digital camera or the like.
When, therefore, raw image data is input, an extraction area in the raw
image data is determined on the basis of the size of an image display
area in which a processed image is displayed and a magnification set at
this time. A developing process is then performed for partial raw image
data in the determined area, and the resultant data is displayed in the
image display area.