A control server is configured to: receive, through a communication interface, a guidance image data request and specific information which are transmitted from an image processing apparatus, the guidance image data request being a request for guidance image data representing a guidance image of an acquiring procedure for acquiring authentication information required for receiving service provided by a service providing server connected to the image processing apparatus through the network; determining location information representing a location of data to be accessed in the acquiring procedure, based on the specific information transmitted from the image processing apparatus; generating the guidance image data representing the guidance image including the location information determined by the location information determining processing, when the guidance image data request is received from the image processing apparatus; and transmitting the guidance image data to the image processing apparatus through the communication interface.