This thesis intend to understand the educational effectiveness of computer`s game. For this aim, this thesis pay attention to the characteristics of the narrative in computer`s game. The charateristics of the narrative in computer`s game is consoldated in three. (1) Only the element of act is appeared in the narrative in computer`s game. The computer`s game intend the reader to connect the act. (2) The actant of narrative is simplified. (3) The cause and efeect is excluded from the narrative in computer` game. This characteristics is presented in reader`s side. (1) The reader`s active role is important in the construction of narrative in game. (2) The reader understand retrospectively the construction of narrative by selection. The reader understand the meaning of his owm selection when game end. (3) The reader construct his own amative by changing viewpoint. The game present the only possibility. It is reader`s role to actualize this possibility. Thus the enjoyment of game`s narrative is understood from narrative.