A terminal according to an embodiment is for tracking eyes on the basis of a first eye tracking model in which multiple pieces of learning data related to line-of-sight information are accumulated. The terminal may include a data collecting unit which obtains a facial image of a user using an imaging device, and extracts line-of-sight information about the user from the facial image, a data transmitting unit which transmits, to a server, the line-of-sight information about the user and location information about a point to which a line of sight of the user is directed within a screen of the terminal; a model receiving unit which receives from the server a second eye tracking model obtained by training the first eye tracking model with the line-of-sight information and the location information, and an eye tracking unit which tracks eyes of the user using the second eye tracking model.