An object of the present invention is to provide a game system in which when data is transmitted to a game apparatus of a receiver side, the influence which the transmitted data has on a game progressing in the game apparatus of the receiver side is diversified and the interest of the game is increased.On a display, a field map, which represents all or part of the game field in a plan view as seen from the above, is displayed. A placement request icon is displayed on the display. When touching the placement request icon, a sub-character can be placed at a position where a main character is located. When a sub-character icon is selected and content of an event is determined, the sub-character is placed. When a communication connection with a different game apparatus is established, information related to the placed sub-character is transmitted.