A game system is provided 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. The game apparatus includes a display in which a field map represents all or part of a game field in a plan view as seen from the above. 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.