A method, an apparatus and a system for monitoring are provided. A user interface having a plurality of seat block corresponding to a plurality of location is displayed on a display unit. An image sequence is obtained from each image capturing unit where is disposed on each location in a space. A face recognition algorithm is executed for the image sequence so as to determine whether the image sequence has a human image of a user. If the image sequence has the human image, an eye tracking algorithm is executed for the image sequence. And a corresponding marking action is executed for each seat block based on whether the user gazes a specific direction.
