A control server may receive first location information indicating a location of specific web page data via a data processing device, in a case where a terminal device comprising a web browser receives the specific web page data from a specific service providing server by using a first type of wireless communication and sends the first location information to the data processing device by using a second type of wireless communication. The control server may cause a display unit of the data processing device to display at least N items of account information among M items of account information currently stored in the data processing device, in a case where the first location information is received. Each of the N items of account information may be available for receiving a data providing service from the specific service providing server.