A processing method, which includes receiving a photographing instruction in order to trigger a camera to photograph a target document, identifying four sides of a document image corresponding to the target document, determining a first included angle corresponding to the document image, where the first included angle represents an inclination degree of the document image relative to the target document, triggering the camera to reset a focus location in a direction of far-end content in the document image, and taking n pictures when the first included angle is greater than a preset threshold, applying geometric correction to the pictures obtained through photographing, outputting one of the pictures to which geometric correction has been applied. Hence, the method significantly increase definition of the far-end content in the document image, and improve correction quality of the document image.