A method for processing messages in a multiuser dungeon operating on a computer system connected with other computer systems via a network eliminates message conflicts due to network time delays. The message processing method according to the present invention includes processing a received message when the current received message was generated on the direct basis of an event of an last received message which was received immediately prior to the current received message, processing the current received message as an error when the current received message is was not generated on the direct basis of the event of the last received message or a message received immediately prior to the last received message, stopping the processing of the last received message and processing the current received message when the current received message was generated on the direct basis of the event of the message received just prior to the last received message and the generation time of the event of the current received message is before the generation time of the event of the last received message, and discarding the received message when the current received message was generated on the direct basis of the event of the message received just prior to the last received message and the generation time of the event of the current received message is after the generation time of the event of the last received message.
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