An electronic advertisement system is provided by which, when an advertisement effect that corresponds to billing conditions is not obtained, an advertiser is free from an obligation to pay advertisement fee so that the advertiser can run an advertisement without having an economic risk. An electronic advertisement sending side computer has a billing tag addition means for adding, to electronic advertisement data, a tag composed of information describing billing conditions. A receiving side computer includes: a display unit that outputs, as output data, video and audio of received electronic advertisement data; and an electronic device that acquires the circumstance around the display unit as input data. A program of the receiving side computer has an input video analysis means that determines whether billing conditions for outputted electronic advertisement data are achieved or not by analyzing input data from the electronic device. When the billing conditions are achieved, the program generates billing charge data.