noun
teletext
A broadcasting system that transmits text and simple graphics alongside television signals, viewable on compatible receivers.
文字多重放送でニュースや天気予報を見ることができる。
You can watch news and weather forecasts via teletext.
データ放送 is a broader term for digital data broadcasting, while 文字多重放送 specifically refers to the older teletext system.
Compound of 文字 (character), 多重 (multiplex), and 放送 (broadcast).