To use a small number of signal lines to collect required information in a short time in an information collection system in a device consisting of many constitution parts.

In the information collection system where monitor information in plural constitution parts 2 are collected in a control part 1 by sending response information from plural constitution parts 2 in response to an indication from the control part 1, A collection command line 3 through which a collection command to instruct plural constitution parts 2 to send monitor information is transmitted from the control part 1 to them is provided to realize multi- connection of plural constitution parts 2, and a response line 4 through which response information is transmitted from each constitution part 2 to the control part 1 is provided to realize multi-connection of plural constitution parts 2.