1. An image processing method comprising: a first step of detecting a plurality of data regions from input image data, a second step of rotating said input image data in accordance with inclination of an image within said input image data, a third step of detecting whether said rotated data region protrudes from said input image data previous to rotation, and a fourth step of extracting an area of a size identical to a size of said input image data and having a best relative position with respect to said data regions, when protrusion is detected at said third step.