| 摘要 |
PROBLEM TO BE SOLVED: To provide a no wasteful and positively opened advertisement providing method on a data communication network attached only with advertisement necessary for a sender/receiver of E mail. SOLUTION: In adding of advertisement data to communication data sent and received by the sender/receiver on a communication network by an intermediary agent at a request from an advertiser, the sender/receiver rewrites a protocol of the communication data under the guidance of the intermediary agent and completes an advertisement adding contract, or the intermediary agent rewrites the protocol on the basis of the advertisement adding contract with the sender/receiver, and when partial data inside the communication data matches reference data inherently associated with the advertisement data, the advertisement data is added to the communication data. |
