| 摘要 |
In an electric mail system, when an electric mail is received from another electric mail system, source data is extracted from the electric mail, and it is checked whether destination data identical to the source data is stored in a destination data file. If no identical destination data is stored in the destination data file, the source data is stored, as destination data, in the destination data file, and reception frequency data indicting the reception frequency of the electric mail is generated. In contrast to this, if identical destination data is stored in the destination data file, the reception frequency data is updated. Every time an electric mail is received, the destination data stored in the destination data file are sorted in accordance with reception frequency data. When an electric mail is to be transmitted, retrieval is performed with respect to the destination data file and the destination database to select predetermined destination data. The selected destination data is added to the electric mail to be transmitted.
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