| 摘要 |
An information transmitting device 7 with a light source 3 provided on each container 2 which can be arranged and placed so that a surface having the light source can be hidden. Each information transmitting device judges whether or not in a condition where an own container 2 can be monitored from an imaging direction of an external imaging device and placed so as to hide the light source installed on other containers 2. When judged as affirmative, location information about the other containers is transmitted from the information transmitting device installed on the other containers, and location information about the own container is added to the received location information. This information is transmitted to a storage space which is imaged in an information receiving device 4 by controlling the light source to modulate the received information and to repeatedly flash in terms of time based on the modulated information.
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