要ようするに

よ

う

す

る

に

Common wordJLPTN3Freq.FrequencyTop 10,000

Meanings

1

Used to summarize or rephrase a preceding statement concisely. Often appears at the beginning of a sentence.

、

彼かれ

は

その

計けい

画かく

に

反はん

対たい

な

の

だ

。

In short, he is against the plan.

要ようするに、もっと努ど力りょくが必ひつ要ようだということだ。

To sum up, it means that more effort is needed.

つまりN3
つまり is a casual everyday word for summarizing, while 要するに sounds a bit more formal and is common in writing or speeches.
すなわちN3
すなわち is used in formal or academic contexts to rephrase or define something precisely, while 要するに is used to boil a point down to its essence.
要ようは
要するに and 要は both mean 'in short', but 要するに is slightly more formal and common in writing, while 要は is more conversational.
いわばN2
要するに means 'in short, to sum up' and states a conclusion, whereas いわば offers a figurative or alternative way of describing something.

From the verb 要する (to require, to need) in its adverbial form 要するに, literally 'in needing', which developed into a set phrase meaning 'in short'.