A collection/distribution server divides processing task accepted from a customer terminal into a plurality of processing units, and transmits the units to at least one or more user terminals. The collection/distribution server receives processing results of execution on the user terminals, and integrates the processing results to send back to the customer terminal. The user terminal registers with an application server in advance for receiving a task commission from the collection/distribution server, and receives a license application from the application server. When the license application receives a processing unit from the collection/distribution server, the license application executes the processing on the user terminal. The license application sends back a result of the processing to the collection/distribution server via a network. The user terminal receives a specified service as good value for executing the processing task substituting for a contractor.