In one embodiment, a method for handling subtasks within a business task includes providing a plurality of user interfaces pertaining to the business task having at least one subtask step. The charge system includes an electric power source charging a vehicle having a battery, a power supply unit for supplying electric power from the electric power source to the vehicle, and a power cable communication unit for performing power cable communication concerning the vehicle and the charging via the power supply unit. In response to receiving the first request, the information regarding the communication system is retrieved from a plurality of information systems, and a portion of the information retrieved from a first information system of the plurality of information systems is displayed.