An imaging apparatus sets a search condition of image data so as to contain a condition that image data to be searched is created between a latest send image data that has most recently been sent among pieces of image data, which are read from a storage unit and sent to a display device or which are sent from either the imaging apparatus or other imaging apparatus to the display device, and image data that is created at the earliest time after the latest send image data has been created among the pieces of the image data stored in the storage unit; determines image data to be sent to the display device from among pieces of image data stored in each of the imaging apparatus and the other imaging apparatus, based on a search result sent from the other imaging apparatus as a response to the sent search condition.