In an environment in which various usable information processing device exist in the neighborhood of a user, it is possible to a detect, from a main terminal used by a user, an information processing device having the function corresponding to a user request. By using the detected device, it is possible to perform data processing and data communication corresponding to the user request, which cannot be performed by one device. By transmitting a resources finding/using query packet to devices capable of data communication, the function confirmation and the environment setting of each information processing device can be performed. Even if the function of the information processing device dynamically changes, the device can be used based on the updated information.