| 摘要 |
According to one aspect of the present invention, provided is a method for providing customized information by using a super-directional ultrasonic signal, comprising the steps of: acquiring context information from a target user terminal device receiving a super-directional ultrasonic signal generated by a super-directional speaker; and providing customized information to at least one of the target user terminal device and other user terminal devices having a preset correlation with the target user terminal device, by referring to the acquired context information. |
