1. An event generator comprising: a score calculating unit that receives input of information concerning scene switching points in plural systems, sets each of the scene switching points as an event candidate point, and calculates a score at each of the event candidate points on the basis of information concerning the scene switching points in the plural systems at each of the event candidate points; and an event selecting unit that selects a predetermined point as an event on the basis of the score of each of the event candidate points calculated by the score calculating unit, wherein the event selecting unit selects, as an event, the event candidate point that satisfies a condition that the score is equal to or higher than a threshold, wherein the event selecting unit selects, as an event, the event candidate point that satisfies a condition that no other event candidate point having a score larger than a score of the event candidate point is present in a range of a shortest event interval before and after the event candidate point, and wherein the event selecting unit selects, when no event candidate point that satisfies a condition that the score is equal to or higher than the threshold and no other event candidate point having a score larger than the score of the event candidate point is present in a range of the shortest event interval before and after the event candidate point is present in a fixed range after the shortest event interval and before a longest event interval from another event candidate point selected as an event, the event candidate point having a maximum score among the event candidate points in the fixed range as an event.