Abstract: When enlarged/reduced images to be displayed based on a predetermined original image are displayed on a display screen, each of the enlarged/reduced images is created and displayed at a higher speed. Therefore, desired regions within an original image are designated, and desired images including the entire designated desired region are read from the original image, and stored separately from the original image. Then, an enlargement/reduction ratio with respect to the original image is acquired, and an enlarged/reduced original image obtained by enlarging/reducing the original image with the enlargement/reduction ratio in both a long-side direction and a short-side direction is created and displayed on a display screen.

Abstract: In order to display a digital drawing on a display screen of a terminal device at a scale reduction compliant accurately to actual dimensions, a CPU of a tablet-type terminal device displays drawing data of a digital drawing on a display screen at a predetermined scale reduction. At this time, the CPU references attribute information of the data of the digital drawing, compares it with a display density of the tablet-type terminal device, and displays a design drawing on the display screen at a selected fixed scale reduction. In this configuration, the drawing data at a scale reduction compliant accurately to actual dimensions can be displayed on the display screen of the terminal device. Since the display compliant accurately to the actual dimensions is achieved, a user can measure distances and dimensions by directly using a triangle scale on the display screen.

Abstract: When a plurality of enlarged/reduced images to be displayed based on a predetermined original image are displayed on a display screen, each of the enlarged/reduced images is created and displayed at a higher speed. Therefore, desired regions (vertical/horizontal target regions (532 and 533)) within an original image (690) are designated, and desired images (vertical/horizontal target images (700 and 710)) including the entire designated desired region are read from the original image, and stored separately from the original image (690). Then, an enlargement/reduction ratio (P) with respect to the original image (690) is acquired, and an enlarged/reduced original image (620) obtained by enlarging/reducing the original image (690) with the enlargement/reduction ratio (P) in both a long-side direction and a short-side direction is created and displayed on a display screen (53).

Abstract: In order to display a digital drawing on a display screen of a terminal device at a scale reduction compliant accurately to actual dimensions, a CPU 52 of a tablet-type terminal device 50 displays drawing data of a digital drawing on a display screen 51 at a predetermined scale reduction. At this time, the CPU 52 references attribute information of the data of the digital drawing, compares it with a display density of the tablet-type terminal device 50, and displays a design drawing on the display screen 51 at a selected fixed scale reduction. In this configuration, the drawing data at a scale reduction compliant accurately to actual dimensions can be displayed on the display screen of the terminal device. Since the display compliant accurately to the actual dimensions is achieved, a user can measure distances and dimensions by directly using a triangle scale 100 on the display screen 51.

Abstract: Disclosed are a server system and a security system equipped with a function for preventing illegitimate alteration of data, which are simple and inexpensive, and are capable of operating safely on a 24-hour basis. In a server system equipped with a hard disk drive, which stores at least an operating system, an application software and a content data, and receives connections from a plurality of clients through a network, the hard disk drive is provided with a mode changing switch capable of physically switching the mode of the hard disk drive between a normal mode in which writing to the hard disk drive can be performed and a read-only mode in which writing cannot be performed, whereby the hard disk drive can be operated in the read-only mode.