Abstract: A system for providing information using a watermarking technique includes a signal generating means for inserting an information data into a sound source to generate an audio signal having the information data; a signal transmitting means for transmitting the audio signal to a user terminal; and an information extracting means for extracting the inserted information data from the audio signal, and the information extracting means is configured separately from the user terminal, and receives the audio signal from the user terminal, extracts the information data from the audio signal, transmits the extracted information data to the user terminal to provide the information data to the user. Therefore, the user can be provided with related information and corresponding contents through the sound source regardless of time, space, and online or offline. Further, the system provides information using audio watermarking with high robustness and reduced detection time.