| 摘要 |
<P>PROBLEM TO BE SOLVED: To solve the problem that a time-stamp station cannot be dynamically selected in accordance with user's wishes. <P>SOLUTION: A response time acquisition part 121 stores a response time of each time-stamp station in a response time storage part 111, and a time-stamp request accepting part 122 accepts a time-stamp request to an electronic document stored in an electronic document storage part 115 from a user and acquires an available period when an electronic signature of the electronic document has the available period, and a time-stamp station selection part 123 selects a time-stamp station which can issues a time-stamp before the available period and meets a preference condition, and an available period on the basis of information stored in the response time storage part 111, a time-stamp attribute storage part 112, a correction time storage part 113, and a preference condition storage part 114, and a time-stamp acquisition part 124 requests a time-stamp to the selected time-stamp station with the selected available period. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
