Mac iWork Pages: How can I create internal links?
I mean, such as one word, as a link, it can lead me go to other page which I set before. (All in one .pages file)
Double click the desired destination word, and then use Insert > Bookmark to define a bookmark.
Go to the word or phrase you want to send you to the spot above, and in the Inspector window under the Link section, check the box 'enable as a hyperlink'. Choose the destination as a bookmark, the same one you created earlier. The Inspector window is available (if it's not automagically open) by pressing the (i) button on the toolbar.
Here's a screenshot of the inspector:
Once more, just highlight the word you want to use as a link, and then use the inspector to set the link destination as a bookmark.