Display apparatus that displays marker on position of target character and displays next marker according to slide operation

A display apparatus comprising:

• a display device;
• a touch panel that detects a contact on the display device and a contact position, the touch panel being located on a front face of the display device;
• a storage device in which document data is stored;
• and
• a control device that includes a processor and, through the processor executing a control program, acts as:
• an operation receiver that receives an instruction according to a touch operation performed on the display device and detected by the touch panel;
• a display controller that causes the display device to display the document data stored in the storage device, when the operation receiver receives an instruction to display the document data:
• a searcher that searches, when the operation receiver receives an input of a character to search, the document data displayed on the display device for a target character that accords with the character to search;
• and
• a marker display controller that displays a marker on a position corresponding to the target character detected by the searcher,
• wherein the display controller (i) causes the display device, when the operation receiver receives an instruction based on a slide operation, performed on the marker displayed on the display device and detected by the touch panel, to display a next marker located on an opposite side, in a direction of the slide operation, and (ii) causes the display device, when the operation receiver receives an instruction based on a slide operation, performed on a position other than the marker displayed on the display device and detected by the touch panel, to scroll a screen on the display device in the direction of the slide operation,
• wherein the control device further acts as an operation assisting region display controller that causes the display device to display an operation assisting region of a predetermined size larger than a region of the target character, and surrounding the region of the target character larger, when the target character detected by the searcher is composed by only a single character, or when the region of the target character is smaller than a predetermined threshold,
• wherein the display controller (i) causes the display device, when the operation receiver receives the instruction based on the slide operation, performed on the operation assisting region displayed on the display device and detected by the touch panel, to display the next marker located on the opposite side in the direction of the slide operation, and (ii) causes the display device, when the operation receiver receives the instruction based on the slide operation, performed on a position other than the operation assisting region displayed on the display device and detected by the touch panel, to scroll the screen on the display device in the direction of the slide operation,
• wherein, when the target character detected by the searcher is composed by only a single character, the operation assisting region display controller causes the display device to display the operation assisting region, formed as a circular region including the target character at the center, and having a diameter corresponding to a length of a plurality of characters,
• wherein, when the region of the target character detected by the searcher is smaller than a predetermined square region which is the predetermined threshold, the operation assisting region display controller causes the display device to display the operation assisting region formed as a circular region having a diameter which is integer multiple of a length of a side of the predetermined square region or as a square region each side of which has a length which is integer multiple of the length of the side of the predetermined square region.