Abstract: An image control circuit of one terminal apparatus reads image data corresponding to a designated reference numeral from a display content storage circuit and displays this on a monitor device and, at the same time, transmits the data indicating the reference numeral to another terminal apparatus via a communication line. An I/F circuit of the other terminal apparatus receives the reference numeral sent from the first terminal apparatus side nd outputs this to its image control circuit. The image control circuit of the other terminal apparatus stores this data in the display content storage circuit and, at the same time, reads the reference numeral and the image data corresponding to this reference numeral from the display content storage circuit and displays the same in a predetermined part of the screen of the monitor device.

Abstract: A rotary magnetic head drum apparatus for a video tape recorder of a helical scan type having small projecting members provided on a fixed drum of a rotary magnetic head assembly in the vicinity of the switching positions at the entrance and exit sides for a magnetic tape. The projecting members cause the magnetic tape locally to be displaced radially outward from the surface of the fixed drum so as to reduce longitudinal vibration of the magnetic tape and hence reduce impact error in a signal reproduced on the magnetic tape by two rotary magnetic heads.