Advertisement providing method and system thereof, and apparatus supporting the same

The present invention relates to a system and a method for sending an advertisement, and an advertisement sending service device. The system for sending an advertisement comprises at least one advertiser terminal for requesting to send at least one advertisement; an advertisement output terminal for outputting at least one among a plurality of advertisements requested by the advertiser terminal; and an advertisement sending service device for supporting correction to the shortfall of a certain time based advertisement exposure schedule amount by calculating an advertisement exposure schedule amount for a CPM advertisement among the advertisements as an entire schedule amount, a daily schedule amount and a minute based schedule amount to be sent, calculating an exposure schedule amount for selecting the advertisement by applying a mean CTR for dividing the number of the accumulated clicks of the advertisement corresponding to a CPC advertisement during a certain time by the accumulated exposure frequency, determining a certain time based advertisement selection schedule amount depending on contract conditions and outputting a correction advertisement cost as much as the shortfall amount if the certain time based advertisement selection amount fails to achieve the advertisement selection schedule amount so that the correction advertisement cost can be reflected in the next schedule of sending the corresponding advertisement. [Reference numerals] (401) Identify advertisement information; (403) Design advertisement transmission schedule information; (405) Transmit an advertisement; (407) Collect an advertisement exposure amount and and advertisement selection amount; (409) Advertisement selection plan amount within a certain time met?; (411) Calculate a correction advertisement cost; (413) Update the advertisement transmission schedule information based on the correction advertisement cost; (415) Complete the advertisement within the corresponding time; (417) Advertisement finished ?; (AA) Start; (BB) End