To surely and easily perform the maintenance work of a main body side ultrasonic diagnostic system on a remote side without having a service person go to the main body side.

Operation panel information showing the operation state of the operation panel 14 of the main body side 10 and the image data of the entire screen displayed on an image monitoring device 16 are sent to the remote side 30. On the remote side 30, in the image monitoring device 34, an operation panel image 39 generated by an operation panel image generator 32 on the basis of the operation panel information is displayed together with a main body side monitoring image 38. When a cursor is moved on the screen of the image monitoring device 34 by operating a mouse 36, the cursor is positioned on the specified operation button image of the operation panel image 39 and a mouse button is clicked, an operation signal generator 37 generates an operation signal similar to the one at the time of actually operating the operation button on the operation panel 14 of the main body side 10 and sends it to the main body side 10.