A system supporting method for compensating a participant of a custom league performed by an online game system and an online game system therefor are disclosed. A system supporting method for participant compensation of a custom league according to the present invention includes: generating a customized league customized according to an input of a player; Inviting a user to the custom league and receiving a participation application from a participant who has accepted the invitation; Determining a ranking according to a rule set by the host when a custom league is created and a custom league is created; Determining the size of the system-paid goods; Adding or replacing the system payable goods with game goods stored in the custom league to construct custom league compensation; The step of distributing the custom league compensation to the participant according to the ranking according to the league result and the rule set by the host when creating the custom league.
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