Wireless communication device, wireless communication system, and computer readable storage device

A wireless communication system comprising:

• a first wireless communication device having a first directional antenna configured to wirelessly transmit data;
• and
• a second wireless communication device having:
• a second directional antenna configured to wirelessly receive data from the first wireless communication device;
• a processing unit configured to perform a first detection process of controlling a directivity direction of the second directional antenna and detecting a first direction which is a direction of a radio wave generation source other than the first wireless communication device and a second detection process of controlling the directivity direction of the second directional antenna and detecting a second direction which is a direction of the first wireless communication device;
• and
• a control unit configured to set a directivity angle of the second directional antenna to a narrower angle when the second detection process is performed by setting the directivity direction of the second directional antenna in a vicinity of the first direction than when the second detection process is performed by setting the directivity direction of the second directional antenna to a direction other than the vicinity of the first direction, and to control the directivity direction of the second directional antenna to suppress an influence of radio waves from the radio wave generation source at the time of receiving the data when the second direction is the vicinity of the first direction.