A system for controlling a volume of a broadcast advertisement including an advertisement agency server, a broadcaster server, a monitoring apparatus, and an advertisement company server, which are connected through a wire or wireless communication network is provided. The advertisement agency server includes an advertisement material storage unit, an advertisement material conversion unit, an advertisement watermark generation unit, a format conversion unit, and a cost calculation unit. The advertisement material conversion unit includes an advertisement reference volume storage unit for storing reference volume information of a volume included in the advertisement material, a volume comparison unit for comparing to determine whether an advertisement reference volume is different from a broadcaster reference volume stored in the broadcaster reference volume storage unit, and an advertisement volume conversion unit for storing the advertisement material having a changed volume and converted advertisement information in the advertisement agency server.