Abstract: A geometrical graphic form (for example, a straight line 100) displayed on a geometrical window GW1 is selected, and a copy operation is carried out. When pasting is carried out for a formula window CW1, the selected geometrical form object is converted into the corresponding formula (for example, y=x), and the converted formula is displayed on the formula window CW1. A display region (for example, a specified region T1) of the formula is selected, and a copy operation is carried out. When pasting is carried out for the geometrical window GW1, a functional graph graphic form 102 is displayed on the geometrical window GW1 based on the selected formula.

Abstract: A geometrical graphic form (for example, a straight line 100) displayed on a geometrical window GW1 is selected, and a copy operation is carried out. When pasting is carried out for a formula window CW1, the selected geometrical form object is converted into the corresponding formula (for example, y=x), and the converted formula is displayed on the formula window CW1. A display region (for example, a specified region T1) of the formula is selected, and a copy operation is carried out. When pasting is carried out for the geometrical window GW1, a functional graph graphic form 102 is displayed on the geometrical window GW1 based on the selected formula.

Abstract: An automatic performance apparatus includes input circuitry for serially inputting musical sound information of a predetermined melody and musical sound information to be imparted to the melody, in accordance with progressions of the melody and a chord. A storage device serially stores the musical sound information inputted, and readout circuitry successively reads out the musical sound information stored in the storage device. Accordingly, the musical sounds based on the read out musical sound information are reproduced, and a melody and a chord are played simultaneously.