Degree of influence measurement device and degree of influence measurement method

The degree of influence measurement device measures the degree of influence of a moving first subject, for example, a person or an advertisement vehicle, on a second subject such as a person. The degree of influence measurement device is equipped at least with: a measurement unit for measuring at least a degree of influence; and an output unit for outputting the degree of influence. Specifically, the degree of influence measurement device determines whether or not there is a second subject on which a first subject may have an influence, determines whether or not there is a reaction from the second subject, and measures the degree of influence of the first subject on the second subject based on the determination result. Also, the degree of influence measurement device may be configured such that the presence of the second subject and the reaction from the second subject are determined by analyzing image data captured of the second subject from the first subject by using a camera.