A robot in a robot system including a plurality of robots each having a function of identifying a monitoring target and transmitting information related to the monitoring target to a remote site. The robot includes an acquiring unit that acquires sensing data related to the monitoring target, a communication unit that communicates with another nearby robot, and a control unit that controls the communication unit such that an alert mode transition request signal is transmitted to the other nearby robot if it is determined that a first monitoring target is in an abnormal state on a basis of the sensing data. The robot transitions to an alert mode in which a process according to the received alert mode transition request signal is performed if the alert mode transition request signal related to a second monitoring target is received.