A state display device comprising: a liquid crystal display unit; and a rendering generation unit which generates display content to be displayed in said liquid crystal display unit, wherein said rendering generation unit includes a central processing unit, a rendering processing unit, first storage means, and second storage means, said first storage means is readable and writable by both said central processing unit and said rendering processing unit, said first storage means comprising a device control program region being adapted to store a device control program instructions used to control the operation of said state display device, said second storage means is readable and writable by said rendering processing unit and readable by said liquid crystal display unit, said central processing unit is configured to interpret and execute a display program and to instruct said first storage means to store a rendering request obtained in accordance with a result of the execution of the display program, said rendering processing unit includes an instruction address register to store an instruction address serving as an address of said rendering request to be executed, a start/end instruction register to store a starting command for instructing start of a rendering execution process from said central processing unit, and an interruption factor register to store an interruption factor issued to said central processing unit, said rendering processing unit is configured to perform a series of rendering execution process including a process of interpreting said rendering request stored in said first storage means in accordance with said instruction address in said instruction address register, a process of executing said interpreted rendering request, and a process of updating said instruction address in said instruction address register into a next instruction address to perform said series of rendering execution process independently from said central processing unit, in said process of executing said interpreted rendering request, said rendering processing unit is further configured to perform, when said interpreted rendering request is a rendering execution request, a process of calculating a coordinate and a color of a luminous point of liquid crystal in accordance with an upper-left coordinate, a lower-right coordinate, a line thickness and a color specified by said interpreted rendering request, and a process of storing the coordinate and the color obtained as the result of the calculation in said second storage means, and to perform, when said interpreted rendering request is a rendering termination request, a process of storing a termination factor in said interruption factor register and a process of issuing an interruption command to said central processing unit, said liquid crystal display unit includes a display address register to store an address of said second storage means and a liquid crystal controller to perform display control of a liquid crystal screen in accordance with coordinates and colors stored in said second storage means specified by said display address register, said central processing unit is further configured to perform a control process on the basis of said device control program instructions separately from said rendering processing unit in a period of time from when storing said starting command to said start/end instruction register to when said interruption command is issued by said rendering processing unit, and to stop said control process and perform an interruption process when said interruption command is issued. a liquid crystal display unit; and a rendering generation unit which generates display content to be displayed in said liquid crystal display unit, an instruction address register to store an instruction address serving as an address of said rendering request to be executed, a start/end instruction register to store a starting command for instructing start of a rendering execution process from said central processing unit, and an interruption factor register to store an interruption factor issued to said central processing unit, a display address register to store an address of said second storage means and a liquid crystal controller to perform display control of a liquid crystal screen in accordance with coordinates and colors stored in said second storage means specified by said display address register,