Information processing device, music playing speed decision system, and program

A music playing speed decision system comprising a detection device configured to detect a crowd level in a store and an information processing device connected to the detection device via a network,

• the detection device comprising:
• an information output component configured to output crowd information representing the crowd level in the store,
• the information processing device comprising:
• a crowd information acquisition component configured to acquire the crowd information outputted from the information output component;
• a decision component configured to decide a speed of a piece of music played in the store, based on the crowd information acquired by the crowd information acquisition component;
• and
• an output component configured to output information about the piece of music played at the speed selected by the decision component.

A non-transitory computer readable storage medium comprising a program for controlling an information processing device, the program causing a computer to perform functions comprising:

• acquiring crowd information representing a crowd level in a store;
• deciding a speed of a piece of music played in the store, based on the crowd information acquired;
• and
• outputting information about the piece of music played at the speed selected by deciding the speed of the piece of music played in the store.