Abstract: Provided are a massively multiplayer online first person shooting (MMOFPS) game service system and method, more particularly, an MMOFPS game service system and method providing various online game modes and capable of promoting teamwork, bonding, and solidarity with peers. The MMOFPS game service method includes preparing for an MMOFPS game service, checking whether teams accessing the game service are three or more, starting the game when the accessing teams are three or more, regarding all users except for allies as enemies, checking whether a user is in a normal state, checking whether an adjacent user is an ally when the user is in the normal state, coming close to the adjacent user to help the user recover when the adjacent user is an ally, and defeating the adjacent user by an execution including melee attack and execution actions such as curb stomp when the adjacent user is a knocked-down enemy.