A musical interaction assisting apparatus is to enhance friendliness between an electronic musical instrument and the player. The player's actions are detected acoustically, visually or physically, and the interaction assisting apparatus interprets the detected player's actions and generates interactive responses thereto. The interactive responses are outputted acoustically, visually or physically for the player, and electronically to control the electronic musical instrument. The interaction assisting apparatus also has a learning function to provide proper responses to the player.