A display form determination unit 102 that extracts, from use history data of a computer service 20 that uses a plurality of application programming interfaces (APIs), the numbers of times of execution of the APIs, and determines display forms for the APIs according to the numbers of times of execution of the APIs, and a display control unit 103 that displays, in a directed graph that represents a node that corresponds to each of the plurality of APIs, the nodes that correspond to the APIs in the determined display forms are included, so that use states of the APIs are easily grasped.