A server receives a correlation instruction from an information processing apparatus when the storage stores first device information uniquely assigned to an image processing apparatus. The correlation instruction is for correlating first device information with a service that a service-providing apparatus provides. The server receives first authentication information from the information processing apparatus. The server stores the first authentication information in association with the first device information in the storage. The server receives, from the image processing apparatus, second device information and first information. The second device information is assigned to the image processing apparatus. The first information is generated in the image processing apparatus for receiving the service. The server identifies the first authentication information in the storage using the received second device information, and transmits second information based on the first information to the service-providing apparatus using the first authentication information.