1. An image processing apparatus, comprising: means for segmenting a source image having a foreground section and a background section into a first image corresponding to the foreground section and a second image corresponding to the background section; means for determining a pixel size of the first image to be displayed and a pixel size of the second image to be displayed using size information of the source image, wherein the size information indicates a pixel size of the source image obtained from a physical size of the source image and a resolution of the source image; means for generating a formatting file based on a markup language, wherein the formatting file indicates the pixel size of the first image and the pixel size of the second image respectively determined by the means for determining; means for applying first image processing to the first image corresponding to the foreground section, wherein the first image processing includes processing that causes a section of the first image corresponding to the background section of the source image to be assigned with a transparent color; means for applying second image processing to the second image corresponding to the background section, wherein the second image processing includes processing that causes a file size of the second image to be less than a file size of the source image; and means for sending a compound image to a client apparatus for display via a network, wherein the compound image is generated by combining the first image and the second image with the formatting file such that the first image and the second image are displayed with the same size and at the same position when the compound image is displayed through the client apparatus, wherein the means for determining further determines a display position of the first image to be displayed and a display position of the second image to be displayed, and the formatting file further indicates the display position of the first image and the display position of the second image respectively determined by the means for determining, and wherein the means for determining updates the pixel size of the first image or the pixel size of the second image according to request size information obtainable from a user instruction for resizing a pixel size of the compound image received from the client apparatus, and the means for generating updates the formatting file when the pixel size of the first image or the pixel size of the second image is updated, wherein the first image and the second image of the compound image are displayed according to the updated formatting file.