To provide a toy device which can be grown as a virtual living thing unique for a player by giving a radio tag, a radio tag reading function, and a network communication function to the toy device of a virtual living thing.

Unique data are stored in a radio tag of a toy device of a virtual living thing. In addition, the unique data are stored in each of the two or more radio tags. A player selects a radio tag out of the two or more radio tags for each play and makes a toy device of a virtual living thing recognize the selected radio tag for the play. The player makes the toy device of a virtual living thing store the memory of the play as a play history. The virtual living thing is grown according to the play history. To prevent the growth process of the virtual living thing from being monotonous, a memory medium can be exchanged and various game effects are generated in the growth process. In addition, to get a similar effect, a virtual world is developed in a network and can be accessed from the toy device of a virtual living thing.