Abstract: A file transmission technique that does not make retransmission control complex even in a case in which a transmission error occurs is provided. A communication terminal executes a transmission job for transmitting an inspection indication file to the apparatus. When there is an error either in transmitting the inspection indication file or in receiving an inspection result file, the communication terminal executes a retransmission job after a predetermined time lapses. At this time, if there is a new transmission job generated for the same apparatus, the retransmission job is deleted. Alternatively, if there is a different retransmission job for the same apparatus, a retransmission job that has been generated first is deleted.

Abstract: An object of the present invention is to provide a technique capable of promptly and efficiently starting a communication processing when a demand is generated, in a communication system including a terminal for a non-continuous connection. A communication terminal and a device can be connected through a relay device, and when the communication terminal transmits a UDP packet to the device, the relay device receives the UDP packet and transmits a control signal to the device. The device makes a dial-up connection to establish a PPP session, and establishes a TCP connection with the relay device. By using this TCP connection, the communication terminal transmits an inspection instruction file to the device. The device conducts an inspection in accordance with the inspection instruction file, prepares an inspection result file, and returns it to the communication terminal. Then, the device disconnects the TCP connection, the PPP session, and the dial-up line network.

Abstract: A file transmission technique that does not make retransmission control complex even in a case in which a transmission error occurs is provided. A communication terminal executes a transmission job for transmitting an inspection indication file to the apparatus. When there is an error either in transmitting the inspection indication file or in receiving an inspection result file, the communication terminal executes a retransmission job after a predetermined time lapses. At this time, if there is a new transmission job generated for the same apparatus, the retransmission job is deleted. Alternatively, if there is a different retransmission job for the same apparatus, a retransmission job that has been generated first is deleted.

Abstract: An object of the present invention is to provide a technique capable of promptly and efficiently starting a communication processing when a demand is generated, in a communication system including a terminal for a non-continuous connection. A communication terminal and a device can be connected through a relay device, and when the communication terminal transmits a UDP packet to the device, the relay device receives the UDP packet and transmits a control signal to the device. The device makes a dial-up connection to establish a PPP session, and establishes a TCP connection with the relay device. By using this TCP connection, the communication terminal transmits an inspection instruction file to the device. The device conducts an inspection in accordance with the inspection instruction file, prepares an inspection result file, and returns it to the communication terminal. Then, the device disconnects the TCP connection, the PPP session, and the dial-up line network.

Abstract: A facsimile receiver provides with confirmation means whether or not there exists transmission mistake at the transmitter side. As soon as receiving of the picture information is finished, receiving person display data representing a division of receiving the picture information, data of representing the day and hour of the receiving and the number of received sheets are transmitted automatically as receipt information to the transmitter.