This is the *European* Toyota EPC (Electronic Parts Catalog). I am unsure of the version, but I beleive it is from some time around 2000. The Japanese-spec EPC should be identical except for the actual vehicle data.
It is used for finding parts, diagrams, and part numbers of Toyota and Lexus vehicles for ordering from your dealer. Quite often it is difficult to explain to a dealer what part you require, and sometimes they order and deliver the wrong part. Many people on the MKIV Supra forums (http://www.mkivsupra.net and http://www.supraforums.com ) use the EPC.