A data amount of a still image to be synthesized is reduced to shorten a transmission time and to reduce a memory utilization spent by the image. The display position of the still image to be synthesized is easily changed to improve operation efficiency. A video synthesizing apparatus which synthesizes a video with a still image includes a video signal receiving unit which receives a video signal including a video, a communication unit which receives a composite signal including a still image having a display size smaller than the display size of the video and position data expressing a synthesis position of the still image with respect to the video, a storage unit which stores the still image and the position data obtained from the composite signal received by the communication unit, and a synthesizing unit which synthesizes the video obtained from the video signal received by the video signal receiving unit and the still image stored in the storage unit on the basis of the position data stored in the storage unit to output a synthesized image.