A camera includes a data acquisition unit, a photographing area control unit, a photographing unit and a communication unit. The data acquisition unit acquires, as photographing information, at least one of time information, information on a position of the sun, information on an angle between a sunlight and a ground, and projection information of an external projection device. The photographing condition calculation unit calculates a photographing condition based on the photographing information. The photographing area control unit controls a photographing area based on the photographing condition. The photographing unit generates an image data by photographing the photographing area. The communication unit transmits the image data to the external projection device.