1. An electronic device comprising: an operating unit including a storing unit that stores therein a plurality of different display language data that is switchable according to a use environment of a user; a selecting unit that selects a display language data from the storing unit in response to display language specification information supplied from a main unit of the electronic device at a time of starting the electronic device; a displaying unit that displays an operation screen with the display language data selected by the selecting unit, wherein when the display language specification information is not supplied from the main unit, the selecting unit compares the display language data stored in the storing unit and the display language data set in a factory setting to check whether the display language data has been changed from the factory setting according to the use environment of the user and, when the display language data has been changed from the factory setting, the changed display language data is selected for display; when the display language specification information is supplied from the main unit, the language data displayed is according to the specified information; and when the display language specification information is not supplied from the main unit within a desired time, the electronic device determines that an abnormal operation has occurred in the main unit.