The present invention relates to internet broadcast and, more particularly, to a broadcast jockey (BJ) mid-advertisement system and a BJ mid-advertisement method capable of actually financially helping a BJ by delivering mid-advertisement in addition to various information and videos provided by the BJ, and maximizing the advertising effects by making viewers watch the mid-advertisement by delivering the mid-advertisement during ad time through which the BJ is still broadcasting, not by separately providing advertisement regardless of the internet broadcasting. In a BJ terminal for receiving internet broadcast basic information from a server and transmitting the internet broadcast information to watch internet broadcast from a viewer terminal, the BJ terminal receives mid-advertisement basic information and mid-advertisement media information from the server and transmits the mid-advertisement media information to a viewer terminal through network means so as to make the viewer who is currently watching the internet broadcast watch the mid-advertisement.
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