1. A scenario-based load testing apparatus, comprising: a packet analysis unit for creating a virtual map and game grammar by capturing and analyzing packets sent between a server and a client; a scenario creation unit for creating a scenario of a virtual user on the virtual map; and a load generation unit for generating a load by creating packet data corresponding to the virtual user in compliance with the game grammar and the scenario, wherein the scenario creation unit creates the scenario by defining locations of the virtual user on the virtual map and actions for the locations.