An online video game controlling server includes an online game information storage database for storing game information on an online video game that includes player information on player characters and area information on a game area of the online video game, and a control section for controlling the progress of the video game on the basis of the game information. A shared area and an unshared area are provided in the game area of the online video game. When one player character moves to the unshared area, the control section creates instance information including area specifying information, character identification information and instance creating necessary object information. In addition, the control section server breaks communication between the one player character and the other belonging player character to update the instance information whenever the progress state of the instance creating necessary object changes due to the action of the one player character.