案あん内ない広こう告こく

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Meanings

1

noun

classified advertisement; classified ad

A small advertisement in a newspaper or magazine, typically grouped by category such as jobs, real estate, or items for sale.

plan, suggestion, draft

内inside, within, between

広wide, broad, spacious

告revelation, tell, inform

求きゅう人じん広こう告こく
求人広告 specifically refers to job advertisements, while 案内広告 covers all types of classified ads.
三さん行ぎょう広こう告こく
三行広告 is a more colloquial term for classified ads, literally 'three-line ad', emphasizing the short format.

Compound of 案内 (guidance, information) and 広告 (advertisement). The term is a straightforward description of its function.