Provided are an agent platform, a multi agent system, and a message transmitting/receiving method thereof. The message transmitting/receiving method for a multi agent platform including a first agent platform for managing at least one of a first agent and a second agent and at least one of a second agent platform for managing at least one of a third agent, includes: receiving a plurality of messages from the first agent at the first agent platform; assigning a priority to the received message according to a message type of the message at the first agent platform; and transmitting the message to the second agent or the second agent platform according to the priority.