6. The computer program product according to claim 5 , wherein positive feelings of said positive directed relevance include liking, trusting, respecting, appreciating, obliged to, and negative feelings of said negative directed relevance include competing with.
5. A computer program product readable by a computer, tangibly embodying a program of instructions executable by said computer to perform a method for evaluating relevances between persons, said method comprising: detecting a plurality of relevances between a first person and two or more second persons, and between said two or more second persons and a third person, in a text database, wherein said third person represents a target person, who is to be introduced to said first person by one of said two or more second persons, wherein said first person and said third person are detected by their names, which are input to said computer, and said two or more second persons are detected as names in said text database, wherein said plurality of relevances comprises at least one directed relevance and at least one undirected relevance between said third person and said two or more second persons, wherein said at least one directed relevance comprises: one of a positive and a negative directed relevance corresponding to positive and negative feelings, respectively, as expressed in said text database; and a weight of said one of a positive and negative directed relevance is determined by at least one of a value based on a frequency of occurrence of said one of a positive and a negative feelings as expressed in said text database, and a value based on a period of time from said one of a positive and a negative feelings as expressed in said text database to a current time; and wherein said at least one undirected relevance comprises: one of a positive and a negative undirected relevance corresponding to one of a positive and a negative acting together, respectively, as expressed in said text database; and a weight of said one of a positive and negative undirected relevance is determined by at least one of a value based on a frequency of occurrence of said acting together as expressed in said text database, and a value based on a period of time from said acting together as expressed in said text database to a current time; evaluating each of said plurality of relevances between said first person and said two or more second persons, and between said two or more second persons and said third person, to determine a maximal sum of weights comprising relevances linking said first person to one of said two or more second persons, and linking said one of said two or more persons to said third person; and outputting said name of said second person corresponding to said one of said two or more second persons, as an introducer of said first person to said third person.