The invention relates to a set top box and provides an advertisement ranking and delivering method based on one-way set top boxes. In the prior art, the front ends of the one-way set top boxes cannot acquire usage habits of one-way set top box users, so that the advertisements are difficult to rank and deliver and only the advertizing manner of dividing program packages can be used. The method comprises the steps: the system performs ranking description for merchant advertisements of radio film and television, counts users' habits of watching television programs and enables the statistical result to match with the advertisement ranking sequence; when a user plays a television program, the system delivers the corresponding advertisement to the program video. The advertisement ranking and delivering method solves a problem that the front ends of the one-way set top boxes cannot acquire usage habits of one-way set top box users; the radio and TV group can invite bids for advertising business at premium according to the preferences of set top box users and the earning capacity of the radio and TV group is improved; meanwhile, better return expectation is given to the advertisement investment of advertisers and the advertisement bidding enthusiasm is improved. And the advertisement ranking and delivering method based on one-way set top boxes is suitable for delivering advertisements to the one-way set top boxes.