A method for storing user data according to various embodiments comprises the steps of: receiving a first event signal from an electronic pen; when a first pen input through the electronic pen is detected on a display area where first screen data is displayed, during a first mode operation performed on the basis of the first event, generating first user data according to the first pen input; displaying second screen data on the display area on the basis of a user input on the display area; when a second pen input through the electronic pen is detected on the display area where the second screen data is displayed, generating second user data according to the second pen input; receiving, from the electronic pen, a second event signal corresponding to the first event signal; and storing the first user data and the second user data that are associated with each other, during a second mode operation performed on the basis of the second event signal.