Information processor, server device, communication system, data communication method, program, and computer-readable recording medium

Provided is a display device (200) which is capable of displaying advertisements in each of a plurality of portable terminals. The display device (200) communicates with a server device (400) and is provided with: a collection section (21) for collecting from portable terminals (100A, 100B, 100C) apparatus information of the portable terminals (100A, 100B, 100C) connected to the display device (200); a first transmission section (23) for transmitting the apparatus information collected to the server device (400); a receiving section (24) for receiving from the server device (400) advertisement information denoting advertisements, in accordance with the apparatus information transmitted, the advertisement information being associated with identification information of the portable terminals (100A, 100B, 100C); and a second transmission section (25) for transmitting the advertisement information associated with the identification information to the portable terminals (100A, 100B, 100C) specified by the identification information.