A sound is output by calculating a change in coordinate data as a vector and generating sound data corresponding to the calculated vector, so that sounds can be freely obtained without being limited by the size of or positions on an input coordinate plane. A sound generating apparatus 10 includes a coordinate input device 12 for inputting coordinate data, a main control device 14, an acoustic device 16, and a display device 18. The main control device 14 includes: a motion calculation unit 20 that calculates a vector between two successive sets of the coordinate data input with a predetermined time interval; a sound data generating unit 22 that generates the sound data based on the calculated vector; a musical instrument data generating unit and displayed-color data generating unit 24 that serves both functions of generating musical instrument data and generating displayed-color data based on the coordinate data; a data transfer and saving unit 26; and a MIDI sound source 28 controlled by the sound data.