To run a web search engine what I need: computer with algorithm which is working constantly or if somebody?

click “search” on my Search engine….is that enogh to run surch engine – how about -linking, indexing, crawling – are they included in the algorithm? Does the algorithm has to run always like: 22 / 7 = 3.14………?

you need web crawlers and a lot of disk space and bandwidth, you need to make your own database format and wordlists and then you need to decide which results should show up first in the search.
Or you could just make a meta-search engine, a search engine which uses other people’s search engines when someone clicks the search button. A meta search engine is the easiest to make.

The Turing Test