| 摘要 |
An information collecting system includes a central management computer for collecting and managing information and information collection target machines from which information is to be collected and has a PHS terminal apparatus. Some of the target machines are master units to which outside line telephone numbers and extension telephone numbers are assigned. Each master unit can perform outside line radio communication with the PHS base station and extension radio communication with other target machines belonging to the master unit. The remaining target machines are subsidiary units to which extension telephone numbers are assigned. Each subsidiary unit can perform extension radio communication with only a specific master unit. Pieces of information stored in subsidiary units belonging to the specific master unit are sequentially stored in a subsidiary unit on an upper layer by extension radio communication, together with pieces of identification information identifying the subsidiary units from which the pieces of information are sent. The pieces of information are finally stored in the specific master unit and collected by the central management computer through a PHS base station and a telephone line by outside line radio communication.
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