PROBLEM TO BE SOLVED: To improve a game property of a music game. SOLUTION: A first operation instruction part 403 displays a first operation indication mark indicating the kinds and order of a plurality of operation on a game screen with the prescribed timing of music stored in a music storage part and sound-outputted by a music output part 402. A period indication part 404 displays an operation accepting mark expressing an accepting period which is a period of accepting the input of operation corresponding to the first operation indication mark on a game screen. A first operation judging part 405 judging whether the timing of operation corresponding to the first operation indication mark is within the accepting period and the kinds and order of operation coincides with the indicating contents of the first operation indication mark.
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