According to various example embodiments, an electronic device and an operation method thereof are disclosed. The disclosed electronic device includes: a display; a touch sensitive panel; a memory storing one or more instructions; and a processor configured to execute the one or more instructions stored in the memory to: receive a touch input through the touch sensitive panel, detect a change of a size of the touch input received for a specified time, identify a brush stroke corresponding to the detected change of the size of the touch input among a plurality of brush strokes, obtain trajectory information corresponding to the touch input from a database corresponding to the identified brush stroke, and process the touch input according to the obtained trajectory information corresponding to the touch input and output the processed touch input on the display.