1. An electronic device having a function of switching a language used for on-screen display of an instruction to the electronic device, the electronic device comprising: an input acceptor adapted to accept a command as to language switching; and a controller adapted to allow selection between a first setting method and a second setting method as a method for setting the language to be used for on-screen display, wherein the first setting method is a method that allows the language to be used for on-screen display to be selected from a plurality of alternatives displayed on a screen by use of the input acceptor, the second setting method is a method that, when the input acceptor accepts a first operation, performs on-screen display while switching the language used for on-screen display from one language to another sequentially in a predetermined order at predetermined time intervals and that, when the input acceptor accepts a second operation after the first operation, stops the switching of the language and adopts as the language to be used for on-screen display the language used when the switching is stopped, and the electronic device is one of a reproduction device that reproduces video, a recording/reproduction device that records and reproduces video, and a television receiver.