A content supplying system which uses spatial light transmission comprising: a spatial light transmitter which is provided with an ID information storage portion for storing ID information and also provided with a light emitting portion for emitting spatial light on which the ID information is superimposed; a handheld terminal which is provided with content storing means for storing content information so as to correspond to the ID information and also provided with content reproducing means for reproducing content read from the content storing means as text, images, video or sounds; and a spatial light receiver (30, 60) which is connected to the handheld terminal and provided with a light receiving portion (31, 61) comprising a light receiving element (32, 62) for receiving spatial light emitted from the light emitting portion of the spatial light transmitter and for outputting a light receiving signal as an analog audio signal containing the ID information, wherein ID information obtaining means for obtaining the ID information which is transmitted by being superimposed on spatial light from the light receiving signal of the light receiving portion which is installed at the spatial light receiver or the handheld terminal, and when a user carries the handheld terminal and moves close to the spatial light transmitter, the light receiving element (32, 62) of the light receiving portion of the spatial light receiver (30, 60) receives spatial light emitted from the spatial light transmitter, the ID information obtaining means obtains the ID information which is superimposed on spatial light from the light receiving signal of the light receiving element (32, 62) of the light receiving portion (31, 61), and the content reproducing means of the handheld terminal reproduces the content selected on the basis of the ID information, wherein the spatial light receiver (30, 60) is provided with a light receiving circuit (33, 63) for inputting the light receiving signal of the light receiving element (32, 62) of the light receiving portion (31, 61) and an output terminal for outputting the light receiving signal from the light receiving circuit (33, 63), the output terminal of the spatial light receiver is connected to a microphone input terminal of the handheld terminal, wherein the light receiving signal is input from the spatial light receiver (30, 60) to the microphone input terminal, thereby extracting and obtaining the ID information from the light receiving signal. a spatial light transmitter which is provided with an ID information storage portion for storing ID information and also provided with a light emitting portion for emitting spatial light on which the ID information is superimposed; a handheld terminal which is provided with content storing means for storing content information so as to correspond to the ID information and also provided with content reproducing means for reproducing content read from the content storing means as text, images, video or sounds; and a spatial light receiver (30, 60) which is connected to the handheld terminal and provided with a light receiving portion (31, 61) comprising a light receiving element (32, 62) for receiving spatial light emitted from the light emitting portion of the spatial light transmitter and for outputting a light receiving signal as an analog audio signal containing the ID information, wherein ID information obtaining means for obtaining the ID information which is transmitted by being superimposed on spatial light from the light receiving signal of the light receiving portion which is installed at the spatial light receiver or the handheld terminal, and when a user carries the handheld terminal and moves close to the spatial light transmitter, the light receiving element (32, 62) of the light receiving portion of the spatial light receiver (30, 60) receives spatial light emitted from the spatial light transmitter, the ID information obtaining means obtains the ID information which is superimposed on spatial light from the light receiving signal of the light receiving element (32, 62) of the light receiving portion (31, 61), and the content reproducing means of the handheld terminal reproduces the content selected on the basis of the ID information, wherein the spatial light receiver (30, 60) is provided with a light receiving circuit (33, 63) for inputting the light receiving signal of the light receiving element (32, 62) of the light receiving portion (31, 61) and an output terminal for outputting the light receiving signal from the light receiving circuit (33, 63), the output terminal of the spatial light receiver is connected to a microphone input terminal of the handheld terminal, wherein the light receiving signal is input from the spatial light receiver (30, 60) to the microphone input terminal, thereby extracting and obtaining the ID information from the light receiving signal.