Disclosed are an apparatus and method for transmitting information in a Web-based control system. The control target device of the present invention includes a Web server module, a sound information generation module and an independent communication module. The Web server module transmits a Web page required for device control to a control device through a first communication channel. The sound information generation module generates sound information related to an event, occurring according to variation in status of the control target device. The independent communication module transmits the generated sound information to the control device through a second communication channel that is separate from the first communication channel.