To improve the operability of an input in a music game and to provide a technique enjoyable for every close from a child class to an advanced age class.

The presenting speed for a subject music is adjusted by time taken for inputting the subject music. Whether an output by the input coincides with the subject music or not is evaluated. If not, the subject music is repeatedly presented, the number of times of the repeated display is counted, and when the number of times reaches a threshold, a new subject music is presented.