The present invention, that the content of the content displayed at the client by a user to display the advertisement at a time that is determined to have cognition, users also increases the degree of concentration to the advertisement while concentrating on learning content advertising system and advertising method using the can user content recognition time. Advertisement system and advertising method using the user content recognition time in accordance with the present invention, as main components, a content information confirmation module 202 for confirming the information on the size of the content displayed on the client screen, is displayed on the client an advertisement management module 204 is registered information on the advertisement to be managed is stored, if it is displayed the termination portion of the content on the client screen, content that the client user to generate a stop signal it is determined that the recognized contents of the content it includes a termination confirmation module 206, if it is a stop signal is generated by the content termination confirmation module 206, and the advertisement display module 212 to display an advertisement on one side of the client,.
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