Summary: With the recent spread of PC-LAN systems, difficulties in system construction are expected. In order to facilitate this construction process, we have developed a support tool called Easy Installer. Easy Installer separates the system configuration parameter setup, which is done off-line, from the on-site installation, thus reducing the time spent on PC-LAN system construction. A user-friendly GUI (Graphical User Interface), with a combination of a visual network structure definition and a multi-layer system construction parameter setup, reduces the number of system construction setup operations. Furthermore, a re-usable system configuration parameter file allows a quick modification of PC-LAN systems. Installation tests using Easy Installer have proved its usefulness, justifying our original concept.