1. A method for measuring behavior of a golf club head and a ball, including steps of: attaching at least three marks to a face surface of a head of a golf club; at least three club cameras simultaneously photographing the marks at two points in time before impact; obtaining multiple pieces of two-dimensional data of the marks from signals of images simultaneously photographed at the two points in time before the impact; identifying three-dimensional positions of the marks at the two points in time, from the two-dimensional data of the marks at the two points in time; identifying behavior of the face surface from the three-dimensional position of each mark at the two points in time; identifying time of a contact of the face surface with the ball by updating in a time series the behavior of the face surface and a positional relationship with the ball; estimating behavior of the head at the time of contact of the face surface with the ball; at least two ball cameras simultaneously photographing a hit ball at two points in time; obtaining multiple pieces of two-dimensional data on the ball from signals of images of the hit ball simultaneously photographed at the two points in time; identifying a three-dimensional position and posture of the ball at the two points in time from the two-dimensional data of the ball at the two points in time; and estimating a behavior value of the ball from the three-dimensional position and posture of the ball at the two points in time.