An event processing apparatus has a central processing unit (CPU) and an event queue that temporarily accumulates a plurality of events when occurring. The CPU executes an event queue optimization module for executing filtering processes to delete one or more events based on optimization definition information, and/or for executing chunking processes to integrate a plurality of events into an event, for a plurality of events accumulated in the event queue, based on a CPU load calculation involving the sum of mean CPU-execution-times for unexecuted tasks corresponding to the queued events.