This invention provides compositions and methods providing, e. On condition that data transfer to a transfer apparatus of a transmission destination is completed before a requested transfer completion time, the control apparatus builds a data transfer tree serving as a data transfer path from a transfer apparatus of a transmission source to the transfer apparatus of the transmission destination. The transmission channel response synthesis section gives weights according to the correlation values, weight-synthesizes the first to n-th transmission channel responses, and obtains a synthesized transmission channel response.