A reservation recording module registers program information in a reserved program EPG database and a restriction period in a restriction period setting information. A reserved program keyword extracting module extracts an associative keyword from the program information registered in the reserved program EPG database and registers the associative keyword in an associative keyword database. An information content analyzing module extracts a keyword group from the program information about a now-broadcasting program in electronic program guide (EPG) data. An associated information restriction period determining module specifies as a restriction target program, only a not-yet-viewed program satisfying the restriction period in the respective programs registered in the reserved program EPG database. A program related information determining module calculates, for every restriction target program, an association level between the keyword group registered in the associative keyword database and the keyword group extracted by the information content analyzing module. If there exists the restriction target program with the association level being higher than a predetermined threshold value, an alarm issuing module 39 outputs an alarm message on a display.