Provided is a technology in which users registered in a user league group form a team and complete a mission in a league tour made up of at least one individual league having preset winning points in an online game. A method for providing a league tour mode according to an embodiment of the present invention comprises the steps of: using a server for providing a league tour mode to provide a user terminal with a league tour mode that is a mode formed by at least one individual league that is managed by artificial intelligence and can compete against others, which belongs to a preset user league mode in an online game, and which belongs to another league when preset individual league points are acquired for each league through league tour points provided after a game with an opponent managed by artificial intelligence; when a selection input is received from a user terminal for forming a team for the league tour mode, connecting a user interface for forming a team for a league tour mode that is a team used to play a game together in the league tour mode to a league tour mode screen, and outputting the screen to another user terminal belonging to the same preset user league group as the user; when the team for the league tour mode has completed a game, awarding league tour mode points to a group according to the game results, and determining whether the awarded league tour mode points are more or less than preset individual league points for each league; and outputting preset benefit information according to the completed execution of a preset league to a user terminal, when the league tour mode points awarded in the previous step are more than the preset individual league points for each league.
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