An information processing system comprising a plurality of information processing apparatuses each having wireless communication functionality and being able to execute a predetermined game application, wherein participation information processing apparatuses and non-participation information processing apparatuses (10a, 10b) are included in the information processing system, the participation information processing apparatuses executing the game application in a participation mode and the non-participation information processing apparatuses executing the game application in a non-participation mode, the participation information processing apparatuses and the non-participation information processing apparatuses being portable information processing apparatuses, the participation information processing apparatuses comprise: co-registration means (31, S14, S34) for registering each other's identification information with at least one other participation information processing apparatus after a predetermined authentication process therebetween; and first execution means (31, S20, S37) for wirelessly transmitting predetermined data together with own identification information, executing the game application in the participation mode using data wirelessly transmitted from the information processing apparatus indicated by the identification information registered by the co-registration means, and presenting a result of executing the game application, the non-participation information processing apparatuses comprise: unilateral-registration means (31, S42) for unilaterally registering, in an own apparatus, the identification information of at least one of the participation information processing apparatuses, without performing the authentication process with the participation information processing apparatus; and second execution means (31, S49) for presenting a running state of the game application executed in the participation mode, using the data wirelessly transmitted from the participation information processing apparatus indicated by the identification information registered by the unilateral-registration means, wherein the participation information processing apparatuses and the non-participation information processing apparatus communicate with one another, based on an IEEE 802.11 standard, the participation information processing apparatus transmits a beacon, the participation information processing apparatus receives the beacon, the co-registration means of the participation information processing apparatuses exchange an authentication frame and an association frame therebetween and register each other, and the unilateral registration means of the non-participation information processing apparatus unilaterally registers, in the own apparatus, the identification information included in the beacon transmitted from the participation information processing apparatus, without exchanging the authentication frame and the association frame with the participation information processing apparatus. co-registration means (31, S14, S34) for registering each other's identification information with at least one other participation information processing apparatus after a predetermined authentication process therebetween; and first execution means (31, S20, S37) for wirelessly transmitting predetermined data together with own identification information, executing the game application in the participation mode using data wirelessly transmitted from the information processing apparatus indicated by the identification information registered by the co-registration means, and presenting a result of executing the game application, unilateral-registration means (31, S42) for unilaterally registering, in an own apparatus, the identification information of at least one of the participation information processing apparatuses, without performing the authentication process with the participation information processing apparatus; and second execution means (31, S49) for presenting a running state of the game application executed in the participation mode, using the data wirelessly transmitted from the participation information processing apparatus indicated by the identification information registered by the unilateral-registration means, wherein