[en] An alpha particle diagnostic apparatus was installed to investigate the behavior of energetic ions in JT-60U plasmas. An alpha particle analyzer, which was a main component of this apparatus, was introduced from the loffe Physical Technical Institute, Russia. We developed a software program with complicated functions of controlling the apparatus and acquiring the diagnostic data in sequence of JT-60U discharges, while monitoring the operation status of the apparatus. This software is used on a micro-computer installed in a CAMAC system. The various functions of this software were confirmed in the on-line mode following the sequence. The apparatus is being operated well with the software in JT-60U experiments and is supplying useful diagnostic data. (author)