The invention relates to a method for completing an electronic program guide for television or radio programs. Data for the electronic program guide is received as additional information into television or radio data signals. Succession is matched to air programs, it being checked whether program information is available in the additional information of the tuned program. Existing program information is stored, and programs on which no or incomplete program information is available, are highlighted. Then is tuned to a program are transmitted together on the program information for a plurality of programs, it being checked whether missing data are included for a selected program in the commonly-assigned program information, and discovered data for the selected program are stored.