Abstract: A connection adapter is disposed intervening between a communication module for connection to a radio packet communication network and high-level equipment. The connection adapter comprises a connection controller for controlling connection between the high-level equipment and the radio packet communication network, and a communication controller for relaying the communication by the high-level equipment using the communication module. When the communication controller of the connection adapter detects duplication of a TCP packet received from the high-level equipment, the communication controller discards the duplicated packet.

Abstract: An information terminal wherein a simple operation can provide appropriate contents. An information terminal (1), which provides, based on externally inputted information, predetermined contents, comprises a storage part (12) that stores a plurality of contents; a communication part (22) that receives predetermined information from an external IC chip (A); a display part (21) that displays the contents stored in the storage part (12); and a control part (11) that selects, based on the received information of the IC chip (A) received by the communication part (22), a content stored in the storage part (12), and then causes the display part (21) to display the selected content.

Abstract: A communication device includes a case approximately in a shape of box, data circuit-terminating equipment contained in the case for connecting with a radio packet communication network, and a circuit board provided with a circuit for connecting data terminal equipment and the data circuit-terminating equipment each other and mounted with the data circuit-terminating equipment, with an attachment integrated with the outside of the case.

Abstract: A communication device includes a case approximately in a shape of box, data circuit-terminating equipment contained in the case for connecting with a radio packet communication network, and a circuit board provided with a circuit for connecting data terminal equipment and the data circuit-terminating equipment each other and mounted with the data circuit-terminating equipment, in which the circuit board includes a main circuit board including a first interface circuit for connecting with data terminal equipment and a circuit for intervening communication between the data terminal equipment and the data circuit-terminating equipment, and an auxiliary circuit board including a second interface circuit for connecting the data circuit-terminating equipment and the main circuit board, and the data circuit-terminating equipment is mounted on the auxiliary circuit board.

Abstract: In a management system for vending machines, comprising a plurality of vending machines and a host computer being connected to those vending machines via a network and enabled to manage each of those vending machines in a concentrated manner, the host computer can be accessed from a portable communication terminal via another network.

Abstract: Since a converter, which converts a local side communication protocol of a second communication apparatus into a local side communication protocol of a first communication apparatus and vice versa, is provided between the second communication apparatus and a host computer, a network using the second communication apparatus can be established without correcting the host computer.

Abstract: A portable communication terminal obtains a program for terminals from a host computer and executes it. The program for terminals obtains all or a part of data stored in a database server from the host computer and renews the obtained data. The renewed data is sent to the host computer, and the data in the database server is renewed.

Abstract: In a management system for vending machines, comprising a plurality of vending machines and a host computer being connected to those vending machines via a network and enabled to manage each of those vending machines in a concentrated manner, the host computer can be accessed from a portable communication terminal via another network.