When an access request to a camera apparatus connected to a network via a terminal is issued via the network, a camera management server processes the access request on the basis of an access right set by a user using the terminal to which the camera apparatus is connected. If the server receives from the user a request to purchase the commodity, the server produces a command to deliver the commodity to the user. By these methods and system, a request to access an object can be directed to an appropriate server, without first accessing a centralized dispatching node and without access to detailed mappings of access-typeobject pairs to servers in a distributed computing environment. A summer combines the output of the mixer with the output of one of the front end circuits.