1. A system for generating medical knowledge base information, comprising: a data processor for in response to receiving first and second different medical terms, automatically, forming a plurality of query messages in data source specific formats for querying a corresponding plurality of different data sources for information indicating a potential medical relationship between the received first and second medical terms, using predetermined data source specific message syntax information in identifying first and second information received from first and second data sources respectively, said first and second information indicating at least one type of medical relationship between said received first and second medical terms and determining likelihood of existence of said at least one type of medical relationship indicated by a combination of said first and second information, in response to predetermined information indicating a number of occurrences of the at least one type of relationship in data of at least one of said first and second data source; and an output processor for outputting data representing said first and second medical terms and the at least one type of medical relationship in response to the determined likelihood of existence.