Abstract: The examples of the present invention relates to a mapping server and a mapping method for inter-working between a display controlling computer and portable terminal devices. According to an example of the present invention, a mapping server is configured to store information on terminal call signal displayed on a display area of a display unit controlled by a display controlling computer identified on a network, the information on terminal call signal including color information; receive response signal of a portable terminal device generated by the portable terminal device recognizing the terminal call signal displayed on the display area by the display controlling computer through a photo-sensor installed on the portable terminal device; and map between the terminal call signal and the response signal, thereby linking between the display controlling computer and the portable terminal device on the network.