An advertisement remarketing method, system, and non-transitory computer readable medium, include a gaze tracking circuit configured to track a gaze of a user relative to a plurality of advertisements displayed on content-serving devices to determine a focus level of the user with respect to each of the plurality of advertisements, a list creating circuit configured to create a plurality of ranked lists ranking the focus level of the user for each of the plurality of advertisements, each of the plurality of ranked lists corresponding to a different content-serving device of the content-serving devices, and a remarketing circuit configured to remarket advertisements to the user on a user device based on the plurality of ranked lists.