A digital signal multiplexing device packetizes one or more bitstreams of digital signals to form packets and multiplexes the respective bitstreams on the packet basis to produce plural degree-one multiplexed streams which are received. Moreover, a prediction section specifies a pair of the first time series data and the second time series data, corresponding to the correlation coefficient having the highest value, of a plurality of correlation coefficients calculated by the comparison section and for predicting the use frequency of the first time series data constituting the pair, based on the second time series data. The method also includes receiving by the primary machine using the long-lived connection a task request for supplemental information pertaining to the job, transmitting by the primary machine a task response including the supplemental information to the secondary machine, and receiving a job result for the job using the short-lived connection. Each bet area represents a possible payline with various pay ratios depending on the probability of various predetermined combinations. In particular, the support can be formed integrally with the faceplate in order to simplify the production method.