如何将iframe内容编入索引作为其父容器的一部分？

I have a website that I update some of it's content on monthly basis. The content for those pages include tables in iframe format. Now when I search for that particular keyword i see that google is indexing my iframes individually. Therefore their contents doesn't add any value to the main parent container.Below you'll see one the pages with iframe.I have a website that I update some of it's con