1. An update control device comprising: an acquiring unit that acquires component information that indicates each of components in multiple devices; a classifying unit that calculates the similarity of each piece of the component information related to each of the multiple devices acquired by the acquiring unit and that classifies, on the basis of the calculated similarity, the multiple devices into one or multiple device groups; and an update processing unit that performs, by using a method for updating a common program, a process for updating systems of devices that are classified into the same device group by the classifying unit.