A plurality of information processing systems 10 are connected to a network 90. One of the information processing systems 10 photographs a part of a virtual space shared by the plurality of information processing systems 10. Information of having photographed is transmitted to the other information processing systems 10. The other information processing systems 10 which received the information of having photographed make a photographing effect, e.g., flashlight, shutter sound or others. The method for controlling a network system enables photographing in a virtual space, such as a game space.