A method of synchronizing of a plurality of display apparatuses. The method includes determining a victim function, receiving a count value counting a number of times that the victim function is called in a predetermined period of time from at least one display apparatus, determining a minimum count value by comparing the received count values with each other, and synchronizing the plurality of display apparatuses based on the determined minimum count value such that the plurality of display apparatuses synchronize to the display apparatus with the slowest display execution speed.