In an image outputting system, a monitor simultaneously outputs a plurality of input image data. A management server stores a management table including display starting time regarding each piece of image data. A detecting unit detects an event which requests the monitor to display new image data. A determining unit determines whether or not new image data corresponding to the detected event can be output to the monitor based on the output management information regarding each piece of the image data stored in the storing unit. When it is determined that the new image data can be output to the monitor, the monitor outputs the new image data instead of previous image data determined based on the output management information among image data previously output.