Abstract: There is provided a system for providing virtual machines capable of enabling a user to efficiently use the virtual machines. The system for providing virtual machines executes a virtual router virtualizing means that virtualizes 1st to n-th virtual routers (141 to 14n) on a physical router (11), a virtual firewall virtualizing means that virtualizes 1st to n-th virtual firewalls (151 to 15n) on a physical firewall (12), a virtual machine virtualizing means that virtualizes a plurality of virtual machines (161 to 16n) on a physical server 13, a global network setting means that sets global networks (171 to 17n), a first private network setting means that sets private networks (181 to 18n), and a first virtual machine assigning means that assigns the virtual machines (161 to 16n) to each user.

Abstract: There is provided an identifier authenticating system in which information requesting users can share all predetermined information held in a plurality of information providing servers. In the identifier authenticating system, when an identifier holding user 18 presents an identifier to an information requesting server 16, the information requesting server 16 asks a location managing server 14 about a location of an information providing server 15; the location managing server 14 returns a confirmed IP address of the information providing server 15 to the information requesting server 16 based on the location information; and the information requesting server 16 uses the confirmed IP address to access the information providing server 15 corresponding to the confirmed IP address and receives predetermined information specified by multiplying n pieces of identification information from the accessed information providing server.

Abstract: There is provided an identifier authentication system in which information requesting users can share all predetermined information held in a plurality of information providing servers. In the identifier authentication system, when an identifier holding user 19 presents an identifier to an information requesting server 15, the information requesting server 15 asks a location management server 13 about a location of an information providing server 14 corresponding to the presented identifier, the location management server 13 returns the confirmed IP address of the information providing server 15 corresponding to the presented identifier to the information requesting server 15 based on the location information, the information requesting server 15 accesses the information providing server 14 corresponding to the confirmed IP address by using the confirmed IP address, and receives predetermined information corresponding to the presented identifier from the accessed information providing server 14.

Abstract: An electronic mail transmission/reception system is provided, capable of maintaining the confidentiality of restricted attachments desired to be limited in destination, thereby ensuring the security of the restricted attachments.

Abstract: There is provided an identifier authenticating system in which information requesting users can share all the predetermined information held in a plurality of information providing servers. In the identifier authentication system, when an identifier holding user 18 presents an identifier to an information requesting server 16, the information requesting server 16 asks a location management server 14 about a location of the information providing server 15, the location management server 14 returns confirmed IP address of the information providing server 15 to the information requesting server 16 based on the location information, and the information requesting server 16 utilizes the confirmed IP address to access the information providing server 15 corresponding to the confirmed IP address, and receives predetermined information corresponding to the presented identifier and a disclosure level from the accessed information providing server 15.

Abstract: An electronic mail transmission/reception system is provided, capable of maintaining the confidentiality of attachments, thereby ensuring the security of the attachments. A system management server 11 of an electronic mail transmission/reception system 10 executes: electronic mail separation means for separating received electronic mail into a mail body and an attachment; and file format determination means for determining the file format of the separated attachment based on its MIME type and allowing/disallowing the attachment to be transmitted depending on the type of the determined file format, and stores the attachment allowed to be transmitted by the file determination means and the mail body corresponding to the attachment.

Abstract: An electronic mail transmission/reception system is provided, capable of maintaining the confidentiality of restricted attachments desired to be limited in destination, thereby ensuring the security of the restricted attachments.

Abstract: There is provided an identifier authentication system in which information requesting users can share all predetermined information held in a plurality of information providing servers. In the identifier authentication system, when an identifier holding user 19 presents an identifier to an information requesting server 15, the information requesting server 15 asks a location management server 13 about a location of an information providing server 14 corresponding to the presented identifier, the location management server 13 returns the confirmed IP address of the information providing server 15 corresponding to the presented identifier to the information requesting server 15 based on the location information, the information requesting server 15 accesses the information providing server 14 corresponding to the confirmed IP address by using the confirmed IP address, and receives predetermined information corresponding to the presented identifier from the accessed information providing server 14.

Abstract: There is provided an identifier authenticating system in which information requesting users can share all predetermined information held in a plurality of information providing servers. In the identifier authenticating system, when an identifier holding user 18 presents an identifier to an information requesting server 16, the information requesting server 16 asks a location managing server 14 about a location of an information providing server 15; the location managing server 14 returns a confirmed IP address of the information providing server 15 to the information requesting server 16 based on the location information; and the information requesting server 16 uses the confirmed IP address to access the information providing server 15 corresponding to the confirmed IP address and receives predetermined information specified by multiplying n pieces of identification information from the accessed information providing server.

Abstract: There is provided an identifier authenticating system in which information requesting users can share all the predetermined information held in a plurality of information providing servers. In the identifier authentication system, when an identifier holding user 18 presents an identifier to an information requesting server 16, the information requesting server 16 asks a location management server 14 about a location of the information providing server 15, the location management server 14 returns confirmed IP address of the information providing server 15 to the information requesting server 16 based on the location information, and the information requesting server 16 utilizes the confirmed IP address to access the information providing server 15 corresponding to the confirmed IP address, and receives predetermined information corresponding to the presented identifier and a disclosure level from the accessed information providing server 15.

Abstract: An e-mail transmission system is provided, in which an overflow of the storage capacity of a second server device by attached files can be prevented, and the attached file within the e-mail can be surely transferred from a first server device to a client connected to a second server device. The first server device 1 of the e-mail transmission system separates the received e-mail into mail main text and attached file, while storing the attached file, and appends the transfer request code of the attached file corresponding to the mail main text to the mail main text, and transfers only the mail main text to the second server device. In this system, when the client 9 connected to the second server device 2 requests the first server device 1 to transfer the attached file by using the transfer request code, the first server device 1 transfers the attached file corresponding to the transfer request code to the client 9.