A security system includes a massage machine, and an external terminal capable of communicating with the massage machine via a communication network. The massage machine includes a massager that performs massage on a user, a controller that controls the massager, a first detector that detects a motion of a human body or an object and produces first detection data, a storage that stores the first detection data, and a telecommunicator that connects the controller to the communication network. The controller includes an abnormality determinator that determines presence or absence of an abnormality relating to the first detection data in the storage, and an abnormality notifier that notifies the telecommunicator of the abnormality when the abnormality determinator determines that an abnormality is present.
