Abstract: The map generation device includes a satellite image acquisition unit that acquires a satellite image captured by an artificial satellite, a change point determination unit that determines a change point of the satellite image with time based on the satellite image, and a map generation unit that generates a map based on information of the determined change point. Based on the satellite images, the usage status of the parking lot is reflected in the map.

Abstract: A method of synchronizing databases of a plurality of monitoring devices in a communications system having a communications device, a first monitoring device and a second monitoring device for monitoring the communications device and a network connecting these devices. Each monitoring device accommodates a database. The first monitoring device transmits a control command with a network address of the first monitoring device to the communications device. The communications device transmits the received network address to the second monitoring device. The first monitoring device updates registered data recorded in the database accommodated by the first monitoring device. The second monitoring device transmits a read-out request for reading out registered data which is altered by the updating operation and recorded in the database accommodated by the first monitoring device, to the first monitoring device by using the network address of the first monitoring device received from the communications device.

Abstract: A method of synchronizing data bases of a plurality of monitoring devices in a communications system having a communications device, a first monitoring device and a second monitoring device for monitoring the communications device and a network connecting these devices, in which each of the monitoring devices accommodates a database.

Abstract: A generation management system includes a renumbering device for renumbering pre-edit software in conformity with post-edit and renumbered software for those lines existing commonly in the pre-edit software and post-edit software. By comparing the renumbered pre-edit software and renumbered post-edit software, history information indicative of deletion and insertion of lines is obtained.