A communication apparatus includes a plurality of isochronous transfer processing units, each of which is configured to perform isochronous transfer using an isochronous channel set thereto; a security ensuring processing unit coupled to each of the plurality of isochronous transfer processing units, and configured to perform security ensuring processing to ensure the security of isochronous transfer performed by the corresponding isochronous transfer processing unit; and a security ensuring control unit configured to, in response to a request from a second communication apparatus for ensuring security of isochronous transfer, cause the security ensuring processing unit corresponding to the isochronous transfer processing unit which performs the isochronous transfer using an isochronous channel having been notified from the second communication apparatus along with or in advance of the request for ensuring security of isochronous transfer to perform the security ensuring processing.