Image processing program and image processing apparatus

A game apparatus includes a computer, and the computer reads rendering data from a rendering buffer, and displays a virtual three-dimensional image by utilizing color data and a depth value for each pixel which are included in the rendering data. When a photographing instruction is input, a focused position is detected on the basis of operation information. The computer calculates a difference between a depth value of each pixel included in the rendering data and a depth value of the focused position to generate color data which is subjected to blur processing with respect to blurring objective pixels, and writes the color data in the calculation buffer for each pixel. The computer generates a display image data including a blurred image on the basis of the color data of each pixel stored in the calculation buffer.