judging from; based on; from the standpoint of
Used to express a judgment, inference, or viewpoint based on some evidence or perspective. Often follows a noun or clause.
彼の様子からすると、何かいいことがあったようだ。
Judging from his demeanor, something good seems to have happened.
天気予報からすると、明日は雨が降るだろう。
Based on the weather forecast, it will probably rain tomorrow.
Compound of particle から (from) and すると (when one does), literally 'when one does from...', grammaticalized as a set expression meaning 'judging from'.