I have a long list of Gene Ontology(GO) term with their referred ID and I would like to put this list in an on-line free available webpage and then receive the genes which categorize in each GO term ID.
What species are you caring about? If that is a popularly studied one, some databases may have what you want (i.e. Phytozome, TIGR). If not so, you should do GO annotation first, then get your list as you need.
I want to do a Comparative Transcriptome Study of Insect Pests i have done with GO annotation part .....and i got the related GO terms for species, but i want to retrieve the genes from these GO terms so that i will be able to compare the species on the basis of Upregulated and Downregulated genes.....
I'm not familiar with insects, but I think what you want can be obtain here : http://www.ensembl.org/biomart/martview
Select your species as dataset, then in filter, paste your GO term in "GO Term Accession" ; in attributes select what information you want like "Associated Gene Name" (and chrom, start,stop, etc.)
Last click on "Results".
Another link you might be interessed in http://geneontology.org/page/go-enrichment-analysis, though it seems different from your experiment.