| 摘要 |
<p>PURPOSE:To attain superimposing display of message data without increasing memory capacity so much and without deteriorating communication speed. CONSTITUTION:A data storage part 15 for storing data which is to be overlapped and displayed is provided on an operation display device (POD) 1-side, and a number corresponding to a message which is to be displayed is transmitted from an external device 2 to the POD 1-side. Thus, message data can be displayed by superimposing it with a prescribed area 12 in a fixed screen 11 by reducing transmission data quantity and without increasing memory capacity much.</p> |
