A network system comprising: a first component performing a preset function, the first component having a first device code, wherein the first component includes a control device; and a second component exchanging information with the first component to be communicably connected to the first component, the second component having a second device code, wherein the second component includes an electrical appliance, wherein, when a command for communicable connection is inputted into the first component or the second component, a connection sequence is generated from the component (61, 62) in which the command is inputted to exchange an IP address and the device code of each of the components (61, 62) between one component generating the connection sequence and the other component (61, 62) receiving the connection sequence, and when the electrical appliance is turned off, it is determined whether a power off state of the electrical appliance is caused by an abnormal state or not, wherein, when it is determined that the power off state of the electrical appliance is not caused by an abnormal state, the control device is informed and the power off state is displayed on the control device, and an input unit for turning the electrical appliance on is displayed on the control device, wherein, when it is determined that the power off state of the electrical appliance is caused by an abnormal state, a third component is informed about the abnormal state, wherein the third component is a service center, and the electrical appliance is remotely diagnosed and repaired by the third component using a diagnosis program. a first component performing a preset function, the first component having a first device code, wherein the first component includes a control device; and a second component exchanging information with the first component to be communicably connected to the first component, the second component having a second device code, wherein the second component includes an electrical appliance, wherein, when a command for communicable connection is inputted into the first component or the second component, a connection sequence is generated from the component (61, 62) in which the command is inputted to exchange an IP address and the device code of each of the components (61, 62) between one component generating the connection sequence and the other component (61, 62) receiving the connection sequence, and when the electrical appliance is turned off, it is determined whether a power off state of the electrical appliance is caused by an abnormal state or not, wherein, when it is determined that the power off state of the electrical appliance is not caused by an abnormal state, the control device is informed and the power off state is displayed on the control device, and an input unit for turning the electrical appliance on is displayed on the control device, wherein, when it is determined that the power off state of the electrical appliance is caused by an abnormal state, a third component is informed about the abnormal state, wherein the third component is a service center, and the electrical appliance is remotely diagnosed and repaired by the third component using a diagnosis program.