Abstract: A novel display method with high operability is provided. A data processing device includes a display portion, an input portion, an arithmetic portion, and a memory portion. The input portion has a function of detecting a first contact point and a second contact point and a function of detecting a first path of the second contact point when the second contact point moves while the first contact point is fixed. The arithmetic portion has a function of storing, in the memory portion, data displayed on a region of the display portion where the first path is detected. The input portion has a function of detecting a third contact point and a fourth contact point after detecting the first path, and detecting a second path of the fourth contact point when the fourth contact point moves while the third contact point is fixed. The arithmetic portion has a function of pasting the data stored in the memory portion on a region where the second path is detected.