1. A system for displaying images of a virtual three-dimensional book having one or more virtual pages with virtual objects, the system comprising: a display system capable of executing a display program, wherein images of the virtual three-dimensional book are produced on the display system, the display system includes a degree of interest function for allocating available space on the display system for providing the images on the display system, and the degree of interest function computes a degree of interest for each virtual object to be displayed by adding a first and second integer values, the first integer value representing an intrinsic degree of interest value of a virtual object and the second integer value representing a distance-based degree of interest of the virtual object, the distance-based degree of interest corresponding to at least one of the spatial or temporal proximity of the virtual object.