Abstract: In a preview image display apparatus, a generating section generates preview images. A panel operation controller displays, on a panel, a main preview screen (first preview screen) displaying the preview images and a sub preview screen (second preview screen) displaying the preview images while the main preview screen (first preview screen) and the sub preview screen (second preview screen) are transferred to each other. A system controller instructs the panel operation controller to display alternate transfer between the main preview screen (first preview screen) and the sub preview screen (second preview screen).

Abstract: An electronic device includes a CPU that executes the process execution program to function as a plurality of process execution units as threads and an execution control unit. The plurality of process execution units use the CPU to execute a process. The execution control unit controls executing of the process by the plurality of process execution units. The execution control unit sets a CPU usage priority level for each of the plurality of process execution units. The execution control unit changes the CPU usage priority level of the job of a type other than a specific type to a priority level that is equal to or less than a specific priority level, when the job of the specific type and the job of the type other than the specific type are simultaneously executed.

Abstract: In a preview image display apparatus, a generating section generates preview images. A panel operation controller displays, on a panel, a main preview screen (first preview screen) displaying the preview images and a sub preview screen (second preview screen) displaying the preview images while the main preview screen (first preview screen) and the sub preview screen (second preview screen) are transferred to each other. A system controller instructs the panel operation controller to display alternate transfer between the main preview screen (first preview screen) and the sub preview screen (second preview screen).

Abstract: An electronic device includes a CPU that executes the process execution program to function as a plurality of process execution units as threads and an execution control unit. The plurality of process execution units use the CPU to execute a process. The execution control unit controls executing of the process by the plurality of process execution units. The execution control unit sets a CPU usage priority level for each of the plurality of process execution units. The execution control unit changes the CPU usage priority level of the job of a type other than a specific type to a priority level that is equal to or less than a specific priority level, when the job of the specific type and the job of the type other than the specific type are simultaneously executed.

Abstract: An image forming apparatus includes a data selector circuit that receives an instruction of a selection range from a serviceman via the operation unit and the display unit, and automatically selects data to be backed up in the external storage device in the selection range out of the pieces of data, a backup circuit that backs up the data selected by the data selector circuit out of the pieces of data in the external storage device being connected, and sends the data unselected by the data selector circuit to the database server for backup, and a restoring circuit that restores the data backed up in the external storage device in a first storage after replacement for the maintenance, then receives the data backed up in the database server, and restores the data in the first storage after replacement for the maintenance without the serviceman.

Abstract: An electronic device includes a CPU that executes the process execution program to function as a plurality of process execution units as threads and an execution control unit. The plurality of process execution units use the CPU to execute a process. The execution control unit controls executing of the process by the plurality of process execution units. The execution control unit sets a CPU usage priority level for each of the plurality of process execution units. The execution control unit changes the CPU usage priority level of the job of a type other than a specific type to a priority level that is equal to or less than a specific priority level, when the job of the specific type and the job of the type other than the specific type are simultaneously executed.

Abstract: An image forming apparatus includes a data selector circuit that receives an instruction of a selection range from a serviceman via the operation unit and the display unit, and automatically selects data to be backed up in the external storage device in the selection range out of the pieces of data, a backup circuit that backs up the data selected by the data selector circuit out of the pieces of data in the external storage device being connected, and sends the data unselected by the data selector circuit to the database server for backup, and a restoring circuit that restores the data backed up in the external storage device in a first storage after replacement for the maintenance, then receives the data backed up in the database server, and restores the data in the first storage after replacement for the maintenance without the serviceman.

Abstract: An image forming apparatus processing a plurality of jobs in parallel includes an auxiliary storage device that includes a box, a memory, a PDL-to-box unit, and a box-to-print unit. In response to a request to store a document file in the box, the PDL-to-box unit stores, as an ensured memory size, a size of the memory used in the image-input-to-box function, in the auxiliary storage device by associating the size of the memory with a document file in the box. In response to a request to image-output the document file within the box, the box-to-print unit reads out the ensured memory size, secures an area of the ensured memory size in the memory, and image-outputs the content of the document file.

Abstract: An image forming apparatus processing a plurality of jobs in parallel includes an auxiliary storage device that includes a box, a memory, a PDL-to-box unit, and a box-to-print unit. In response to a request to store a document file in the box, the PDL-to-box unit stores, as an ensured memory size, a size of the memory used in the image-input-to-box function, in the auxiliary storage device by associating the size of the memory with a document file in the box. In response to a request to image-output the document file within the box, the box-to-print unit reads out the ensured memory size, secures an area of the ensured memory size in the memory, and image-outputs the content of the document file.