An image and sound output system includes an image and sound data output device, and an image display device that is connected to the image and sound data output device through a transmission path. Further, the image and sound data output device includes an image and sound data separating unit, an image data transmitting unit that transmits the separated image data to the image display device, a sound data output unit that outputs the separated sound data, an image data analyzing unit that analyzes image data transmitted to the image display device by the image data transmitting unit, a sound output adjusting time creating unit, and a sound output synchronization adjusting unit. Furthermore, the image display device includes an image data receiving unit that receives image data transmitted by the image and sound data output device, an image processing unit.