A computer program makes a computer perform: a measuring process of measuring a beat rate, which is the number of beats of content per unit time; a first detecting process of detecting a beat position; a generating process of generating a beat guide which is to be displayed in accordance with the beat position and which has a substantially uniform interval in accordance with the beat rate along a time axis, on the basis of the beat rate and the beat position; a second detecting process of detecting a positional shift between the beat guide and the beat position; an offset process of adding an offset to a position of the beat guide on the basis of the positional shift; and a displaying process of displaying the beat guide to which the offset is added.