Method for audience measurement of interactive tv contents and apparatus and system using thereof

PURPOSE: An audience measurement method of interactive TV contents, an audience measurement device using the same, and a system thereof are provided to analyze an image which is captured through a camera which is connected with an interactive TV, thereby investigating the viewing rate of the interactive TV contents. CONSTITUTION: An image input unit(120) receives a viewer image from a camera(110). The viewer image is an image in which viewers who watch interactive TV contents are captured. A viewer information acquisition unit(130) extracts a viewer face range from the viewer image and acquires viewer information which includes the number of viewers of the interactive TV contents using the viewer face range. A viewer information transmission unit(170) transmits the viewer information. The viewer information comprises the sex, age or viewing concentration of each viewer.