Tone generating sequence data are sequentially read out in accordance with a performance sequence, and tone generation control parameters are decoded from the read-out sequence data. The decoded tone generation control parameters are sequentially written into a control register. Tone signals are generated on the basis of the tone generation control parameters written in the control register. Pattern register stores pattern data representative of a time series of driven states to be taken by a plurality of light emitting elements. On the basis of the tone generation control parameters written in the control register, the pattern data stored in the pattern register are sequentially output to illuminate the light emitting elements. Particular pattern data may be stored in association with a particular caller so that, when an incoming call has been received from the particular caller, the pattern data specific to the particular caller are read out to illuminate the light emitting elements.