Disclosed herein is a control apparatus for accepting a request for transmission of a content from a content transmission apparatus to the control apparatus and for passing on the request to the content transmission apparatus by way of a communication network allowing a transmission quality to be reserved and for issuing a request to a content accounting server to carry out a content accounting process according to the substance and content quality wherein the control apparatus: receives a specified substance and quality of the content and transmits a request to the content transmission apparatus to transmit the content; determines a transmission quality on the basis of the specified content quality and makes a reservation for the determined transmission quality of a transmission line on the basis of the transmission quality; and issues a request to a transmission-quality accounting server to carry out an accounting process according to the transmission quality.