Abstract: A terminal device for providing location information of a product of interest in a store. The terminal device includes a communicator configured to communicate with the repeaters; a display configured to display information visibly; a storage module configured to store the information; a product location searcher configured to generate a message to request search for a location of a product of interest based on received product search information that is input by a user, transmit the message to the lighting management server through the repeater, and receive product location information that is specified as a location of a lighting device in proximity to the product of interest through the repeater; and a controller configured to generate product-location-representation information that displays an overlay of the received product location on a map and display the generated information on the display.