An image forming apparatus includes a fixing device, a temperature detector, and a support member. Client computers can connect to any available server computer and start or join a conference hosted on either the server computer to which the client computer is connected or any other server in the system. The germanium oxide layer and the metal oxide layer are converted into a first dielectric layer. A second electrode formed on the capacitor insulating film is formed of one of a Cu layer and another Cu layer containing the substance.