To store an electronic mail such that, when storing the very long electronic mail, the whole electronic mail can be rapidly acquired in an extraction stage.
A database management part 102 divides the electronic mail into a plurality of mail messages when a size of the input electronic mail exceeds a prescribed size, and adds the number of divided mail messages and a division number that is a sequence number to each mail message, and a database system 103 stores each mail message in record number order. The database management part 102 acquires a specific mail message set with a specific record number and a prescribed number of succeeding mail messages from the database system 103, integrates the mail messages corresponding to the number of the divided mail messages to acquire the electronic mail before the division when the mail messages corresponding to the number of the divided mail messages are already acquired, acquires the succeeding mail messages corresponding to the number of the insufficient mail messages when the mail messages are insufficient, and acquires the electronic mail before the division.
KATO MAMORU
KORI MITSUNORI
NAKAMURA TAKAAKI
| JP2006048641A | 2006-02-16 | |||
| JP2004252619A | 2004-09-09 | |||
| JP2005215978A | 2005-08-11 |