A heating power control device includes a storage in which first information is stored, the first information being on a cooking process being executed using a cooking appliance, a receiver that receives second information indicating an absence of a user of the cooking appliance or a presence of the user, and a controller that determines whether or not the user is absent for a predetermined period of time based on the second information, determines, based on the first information, whether or not the cooking process is a heating process when the user is determined to be absent for the predetermined period of time, determines, based on the first information, a control method of controlling heating power of the cooking appliance when the cooking process is determined to be a heating process, and controls the heating power of the cooking appliance by the control method.