Method and system for dynamically allocating advertisement

A method and a system for dynamically assigning an advertisement in accordance with a program rating are provided to obtain an advertisement effect corresponding to an advertisement price. An advertisement broadcast assigning server(120) selects a transmitted advertisement broadcast based on a predetermined transmission condition and an analysis result of broadcast view information from viewers. An advertisement broadcast providing server(140) provides the selected advertisement broadcast. The broadcast view information includes a program rating and the transmission condition includes a minimum program rating for transmission of the advertisement broadcast. The advertisement broadcast assigning server selects an advertisement broadcast whose minimum program rating is not larger than the program rating included in the broadcast view information.