The method includes: identifying a type of a data item in which the data is stored, using an overlap pattern indicating the type of the data item and a method for identifying the type; processing the data stored in the data item, using calculation designated for each type of the data item, and adding at least one or more new data items to the type of the data item storing the processed data; and calculating scores obtained by quantifying an amount of information displayed on a display screen for the data items including the added data items and arranging the data items on the basis of the scores.