1. An Eclipse Modeling Framework (EMF) model synchronization method comprising the steps of: calculating a weight based on a hierarchy for an object identifier in a first model, that has been changed, that has been when the change of the first model occurs in an EMF model having an attribute in which the EMF model references a path of an object; accumulating the calculated weight to a sum of weights; comparing the accumulated sum of weights with a predetermined threshold value; and updating the first model and all of second models, which are comprised in an update list, with a content of the change occurring in the first model, when the sum of weights is greater than the threshold value.