| 摘要 |
PROBLEM TO BE SOLVED: To make the state of an electronic mail in a plurality of electronic mail accounts match with the latest electronic mail state all the time when a user having a plurality of electronic mail accounts transmits and receives an electronic mail, etc. SOLUTION: When the electronic mail application C1 of a client 21 receives an electronic mail M1 to an electronic mail address A1, the application C1 allocates an 'ID' and the current 'state' to the received mail M1 to prepare management information MD1, registers the information MD1 and the mail M1 as a pair in a mail management data DB1 and transfers an electronic mail M1' including MD1 and M1 to an electronic mail address A2. When the electronic mail application C2 of a client 22 receives M1', the application C2 registers M1 in an internal mail management data DB2.
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