| 摘要 |
A user (30) visiting an exhibition space (10) or the like is equipped with a mobile device (31) in communication with a service system (35). Media items held by the service system (35) are associated with various locations (20-23) around the exhibition space (10) and a user (30) arriving at such a location is presented with the corresponding item or items. Preferably, these media items are pre-emptively loaded into a cache of the user's mobile device (31) in dependence on the user's progress around the hall (10). Items can also be flushed from cache on this basis. Instead of, or as a precursor to, flushing an item from cache to free up space, the cache space occupied by an item is reduced by degrading it.
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