13. Television comprising: a screen configured to display a television program and/or user information; an information receiving mechanism configured to receive user text information regarding said television program or an operating menu of said television; a screen control mechanism configured to control said screen, which screen control mechanism causes a predefined message to be displayed on said screen, if said user text information is empty or invalid, otherwise said screen control mechanism causes said user text information to be displayed on said screen for a display time, wherein said display time is determined by adding a constant predetermined period of time and a variable period of time which depends on an amount and/or complexity of said displayed user text information, wherein said predefined message is displayed exactly for said constant predetermined period of time, wherein a television channel that is currently displayed on said screen is determined, and wherein said predefined message depends on said currently displayed television channel.
13. Television comprising: a screen configured to display a television program and/or user information; an information receiving mechanism configured to receive user text information regarding said television program or an operating menu of said television; a screen control mechanism configured to control said screen, which screen control mechanism causes a predefined message to be displayed on said screen, if said user text information is empty or invalid, otherwise said screen control mechanism causes said user text information to be displayed on said screen for a display time, wherein said display time is determined by adding a constant predetermined period of time and a variable period of time which depends on an amount and/or complexity of said displayed user text information, wherein said predefined message is displayed exactly for said constant predetermined period of time, wherein a television channel that is currently displayed on said screen is determined, and wherein said predefined message depends on said currently displayed television channel. 15. Television according to claim 13 , comprising: a switching mechanism configured to switch said television program, wherein, upon switching to said television program, said information receiving mechanism receives said user text information.