Abstract: A first apparatus performs a pairing providing process of displaying a provision string on the first apparatus and transmitting the provision string to a server apparatus, the provision string being of a given number of digits that changes every given amount of time in such a manner that, every given amount of time, the provision string is subjected to carrying and a new character is added to the rightmost digit of the provision string. A second apparatus transmits an acceptance string to the server apparatus, the acceptance string being input from the second apparatus based on the provision string displayed on the first apparatus. The server apparatus compares the provision string with the acceptance string, and determines that pairing is established between the first apparatus and the second apparatus when the provision string and the acceptance string match each other.

Abstract: A first apparatus performs a pairing providing process of displaying a provision string on the first apparatus and transmitting the provision string to a server apparatus, the provision string being of a given number of digits that changes every given amount of time in such a manner that, every given amount of time, the provision string is subjected to carrying and a new character is added to the rightmost digit of the provision string. A second apparatus transmits an acceptance string to the server apparatus, the acceptance string being input from the second apparatus based on the provision string displayed on the first apparatus. The server apparatus compares the provision string with the acceptance string, and determines that pairing is established between the first apparatus and the second apparatus when the provision string and the acceptance string match each other.

Abstract: A first apparatus performs a pairing providing process of displaying a provision string on the first apparatus and transmitting the provision string to a server apparatus, the provision string being of a given number of digits that changes every given amount of time in such a manner that, every given amount of time, the provision string is subjected to carrying and a new character is added to the rightmost digit of the provision string. A second apparatus transmits an acceptance string to the server apparatus, the acceptance string being input from the second apparatus based on the provision string displayed on the first apparatus. The server apparatus compares the provision string with the acceptance string, and determines that pairing is established between the first apparatus and the second apparatus when the provision string and the acceptance string match each other.

Abstract: An electronic mail communication system for transmitting and receiving electronic mail to and from a target who does not have a membership registration without disclosure of a personal electronic mail address and also easy in controlling acceptance or rejection of mail. Where the received electronic mail is determined to be target addressed mail, a target actual address is written as a field value of a destination header without changing the text, so as to generate target addressed transfer mail in which a connection address is written as a field value of the source header. Where the received electronic mail is determined to be the user addressed mail, user addressed transfer mail is generated in which the user actual address is written as a field value of the destination header without changing the text.

Abstract: A first apparatus performs a pairing providing process of displaying a provision string on the first apparatus and transmitting the provision string to a server apparatus, the provision string being of a given number of digits that changes every given amount of time in such a manner that, every given amount of time, the provision string is subjected to carrying and a new character is added to the rightmost digit of the provision string. A second apparatus transmits an acceptance string to the server apparatus, the acceptance string being input from the second apparatus based on the provision string displayed on the first apparatus. The server apparatus compares the provision string with the acceptance string, and determines that pairing is established between the first apparatus and the second apparatus when the provision string and the acceptance string match each other.

Abstract: An electronic mail communication system or the like capable of transmitting and receiving electronic mail to and from a target who does not have a membership registration without disclosure of a personal electronic mail address and also easy in controlling acceptance or rejection of mail. Where the received electronic mail is determined to be target addressed mail, the decode means 17 of the mail server device 4 writes a target actual address as a field value of a destination header, without changing a text thereof, thereby generating target addressed transfer mail in which a connection address is written as a field value of the source header. Where the received electronic mail is determined to be the user addressed mail, the encode means 14 generates user addressed transfer mail in which the user actual address is written as a field value of the destination header without changing the text.