INFORMATION TRANSMISSION SYSTEM, INFORMATION SENDING DEVICE, INFORMATION RECEIVING DEVICE, INFORMATION TRANSMISSION METHOD, INFORMATION SENDING METHOD, INFORMATION RECEIVING METHOD AND PROGRAM PRODUCT

An information transmission system includes: an information sending device including a light emitting section that emits light in a plurality of colors, a modulating section that modulates information to be transmitted into signals composed of changes in color, and a light emission control section that controls the light emitting section to emit light while changing color temporally based on the signals generated by the modulating section; and a receiving device including a camera that captures an image having color, and a control and communication section that detects a temporal color change of the light emitting section emitting light by light emission control by the information transmitting device, from images consecutively captured by the camera, decodes the detected color change into information, and outputs the generated information to a display section.