A wireless communication unit forms any one of a first wireless network and a second wireless network, and performs wireless communication with a terminal device. An NFC communication unit performs short distance wireless communication with a terminal device. A controller switches a network of the wireless communication, which is formed by the wireless communication unit, from the first wireless network to the second wireless network, in response to the short distance wireless communication with the terminal device in a case in which the wireless communication unit forms the first wireless network.

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.

In a case where an image forming apparatus operates as a master station determining a communication channel used in wireless communication, the image forming apparatus transmits a second trigger frame that includes information indicating inexecution of carrier sensing and complies with an Institute of Electrical and Electronics Engineers (IEEE) 802.11 standard, to a slave station apparatus connected to the master station.