Each game apparatus participating in a network system has a wireless communication module for performing a one-to-many wireless communication with reference to identifying information and a local communication module for performing a one-to-one infrared communication without referring to it. In a case that the one-to-many wireless communication is performed, pairing processing is executed in a tournament method such that a master and a slave are first decided between its own game apparatus and any one of the game apparatuses over the local communication module, and identifying information stored on the slave side is collected into the master side. In a case that its own game apparatus becomes the only master game apparatus as a result of a series of pairing processing, it transmits a signal including identifying information of all the game apparatuses over the wireless communication module whereas in a case that its own game apparatus becomes the slave apparatus, it receives the signal.
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