Disconnection from a network is easily recognized.A plurality of information processing devices connected over a network is disclosed. The network is built through wireless communication of the plurality of information processing devices. The plurality of information processing devices includes at least a first information processing device and a second information processing device. A detection unit of the first information processing device is configured to detect the second information processing device that is disconnected from the network. A control unit of the first information processing device is configured to output first information about the detected second information processing device as disconnection information.