| 摘要 |
PROBLEM TO BE SOLVED: To provide information for proving the transmitter of communication data that the transmitter himself has transmitted the communication data to a receiver, for instance. SOLUTION: In this data management device 100, a composite information generating part 105 combines time information, change information due to the passage of time and the e-mail address of the transmitter and generates composite information. The composite information is added to the header of e-mail and transmitted to a receiver terminal by a transmitter terminal. For inquiry by the composite information from the receiver terminal, a communication data output part 109 retrieves an e-mail body and the e-mail address of the transmitter corresponding to the composite information, and the retrieved e-mail main body and the e-mail address and the time information used by the composite information generating part 105 so as to generate the composite information are outputted. COPYRIGHT: (C)2007,JPO&INPIT
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