Abstract: Disclosed herein is a HB (Home-Blackboard) protocol which is a hybrid protocol of a HP (Home-Proxy) and a Blackboard in multi-region mobile agent computing environment. The present invention provides the HB protocol which is capable of decreasing the cost of location management and message delivery, solving a following problem with low communication cost, and dealing with the location management and message delivery of cloned mobile agents and parent and child mobile agents in a centralized approach and distributed approach, thereby guaranteeing message delivery of these mobile agents.