SIGNAL CONTROL DEVICE, SIGNAL CONTROL SYSTEM, SIGNAL CONTROL METHOD, AND PROGRAM

A signal control device (50) includes an emergency vehicle information acquisition unit (540) configured to acquire emergency vehicle information including position information on an emergency vehicle, a traffic condition change amount information acquisition unit (550) configured to acquire traffic condition change amount 5 information indicating, for each road section, an amount of change in traffic conditions according to a lighting state of traffic lights, and a signal control unit (560) configured to perform, on the basis of the emergency vehicle information and the traffic condition change amount information, control of the traffic lights provided in a road section on which the emergency vehicle travels. 10