Data communication system, data transmission apparatus and data reception apparatus

The real world objects, set up a transmitter comprising a light emitting unit such as two or more LED of a given physical arrangement is made, by the light emitting unit to blink flashing pattern representing the transmission data of a predetermined bit length data transmission. One receiver is provided with a light receiving portion comprising a two-dimensional light-receiving surface, with decoding the transmission data based on received is blinking pattern, recognizing the object space information based on the flashing position on 2-dimensional light receiving surface to. Therefore, when to obtain information such as the ID from the object in the real world can be simultaneously recognized the spatial position of an object at the same time.