16. The EPG generating apparatus according to claim 12 , wherein the maximum clique set comprises a plurality of maximum cliques, the node of each maximum clique must be greater than or equal to a node threshold, and the maximum cliques correspond to a plurality of optimum keyword groups respectively.
12. The EPG generating apparatus according to claim 11 , wherein the processor constructs a node set according to the inputting keyword group and the program name keyword group, constructs an edge set according to the node set and the semantic similarity degree matrix, and constructs the undirected graph according to the node set and the edge set.