To easily recognize the perspective of a three-dimensionally displayed object and to easily refer to the contents of the object.

This system is provided with a three-dimensional rendering accelerator 6 for generating image data so as to three-dimensionally display the plural objects, a display device 7 for displaying images based on the generated image data, a three-dimensional pointing device 5 for indicating the three- dimensional space position of the displayed image and a focus range change button 50 for changing and setting a focus range in a depth direction based on the indicated space position. In this case, the three-dimensional rendering accelerator 6 generates the image data so as to display the object in the focus range in a focus state and to display the object outside the focus range in a non-focus state.