FIELD: computer engineering, trading equipment. SUBSTANCE: buyer's station has video telephone set for viewing information which is sent or received for arranging a deal, encrypting encoder and decrypting decoder for preservation of sent or received information, and contact keyboard for entering information into video telephone set. Seller's station has computer for transmission and reception of information about type of seller to or from main data center in order to arrange deal, encrypting encoder and decrypting decoder for preservation of security of messages and establishing deal authorization using sent or received information. Main data center is connected to buyer's station and seller's station and has computer processor for centralized transmission, processing and storage of all information and operations with buyer's station and seller's station. Computer is connected to at least one telephone set using electronic means. In addition, it has display for monitoring deals. In addition, it has encrypting encoder and decrypting decoder for authentication of sent or received information, as well as network interface for connection using electronic means and establishing compatibility to computer used by seller's station. EFFECT: possibility of network system extension in data center, increased protection of network system. 9 cl, 7 dwg, 24 tbl
