Information communication method

An information communication device that obtains information from a subject, the information communication device comprising:

• an exposure time setting unit configured to set an exposure time of an image sensor so that, in an image obtained by capturing the subject by the image sensor, a bright line corresponding to an exposure line included in the image sensor appears according to a change in luminance of the subject;
• an image obtainment unit including the image sensor, and configured to obtain a bright line image including the bright line by capturing the subject that changes in luminance with the set exposure time;
• and
• an information obtainment unit configured to obtain the information by demodulating data specified by a pattern of the bright line included in the obtained bright line image,
• wherein the image obtainment unit is configured to obtain the bright line image by capturing light emitted from the subject and expanded by an optical system.