The present invention provides a play extension system enhancing a fun of a toy system by use of network. The play extension system is used by combination with the toy system in which a user can change the setting of parameters affecting motion control of a driving machine, for extending a playing method with the toy system. In the system, the setting information corresponding to the setting state of the parameters is received from a predetermined user terminal through a network, and estimation on the obtained setting information is created by referring to a database which stores the setting information and the information for estimating the setting state correspondingly. The created estimation is transmitted to a predetermined destination through the network.