Patent ID: 8780879

Claim:
A frequency band adjusting method, in a first communication system and a second communication system sharing usable frequency band with each other, for adjusting the frequency band used by a first communication apparatus in said first communication system, to be executed by said first communication apparatus, comprising: determining necessity of increase in a first frequency band used by said first communication apparatus based on an average communication rate per access calculated from the first frequency band used by said first communication apparatus and a number of accesses to said first communication apparatus; determining, when there is necessity of increase in the first frequency band used by said first communication apparatus, whether or not an increase in the first frequency band used by said first communication apparatus is to be approved, according to whether there is an unused frequency band not used by a second communication apparatus in said second communication system having coverage overlapping with said first communication apparatus; and increasing the first frequency band used by said first communication apparatus, when it is determined that an increase in the first frequency band used by said first communication apparatus is to be approved.