A method for operating an image display apparatus includes displaying a timeline indicating past, current and future time regions based on a current time, displaying first information about a past broadcast program in the past time region, displaying second information about a current broadcast program in the current time region, displaying third information about a future broadcast program in the future time region. Items included in the first information may be displayed in a list type format and items included in the second information and the third information may be displayed in a thumbnail type format. Therefore, since visually differentiated content is displayed along the timeline, it is possible to support various functions and to increase user convenience.