A video generating system includes: a plurality of image sensors, arranged to generate a plurality of images and a plurality of synchronization signals corresponding to the images; a combining circuit, coupled to the image sensors, arranged to generate a plurality of output images according to the images, and generate a plurality of output synchronization signals corresponding to the output images according to the synchronization signals; and a bus, coupled between the image sensors and the combining circuit, arranged to perform signal transmission. The image sensors comprise a first image sensor and a second image sensor; and when the combining circuit receives image data of at least a first image generated by the first image sensor, the combining circuit does not receive image data of at least a second image generated by the second image sensor at the same time.