An electronic device may include a display, a memory, and at least one processor operatively connected to the display and the memory. The at least one processor is configured to acquire, based on input of first handwritten information, first personalized feature data corresponding to a first personalized feature from the first handwritten information, acquire, from the first handwritten information, first content data from which the first personalized feature has been removed, encode the first personalized feature data, acquire first masked handwritten information based on the encoded first personalized feature data and the first content data, and provide the first masked handwritten information on the display.