Disclosed are a gaming method and system using skill succession in a sport game. The gaming method may include performing a promotion scenario in which at least one trainer character participates when a promotion mode for a player character is activated in a sports game, configuring a skill set in the at least one trainer character to be handed over to the player character based on an establishment of a relationship between the player character and the at least one trainer character according to the progress of the promotion scenario, and processing the use of the succeeded skill by the player character in a process of performing a sports game instance in which the player character participates.