A microcomputer 50 discriminates a CATV channel plan mode only if there
is a continuous channel among the channels that have been judged that station is
present as a result of determination in the case where the count number for a TV
channel plan is smaller than the count number for a CATV channel plan. However,
in the case where there is no continuous channel among the channels that have been
judged that station is present, the microcomputer 50 also discriminates
a CATV channel plan mode if there is a continuous channel among the channels of
the error data as a result of determination. That is, even when a station adjacent
to the normal broadcasting channel is falsely tuned owing to spurious reception,
the continuity of the CATV channel can be judged normally.